Exhaust Mod - Resonator replaced w/ X-Pipe (video)

[volyer]

I ended up deciding to try the non-res x pipe based on the videos of the two options. If it's crazy loud I can always pay another $150 to swap in the resonated version...

[13ttaz]

After going through this entire form, I pulled the trigger and decided to do the x-pipe mod. I replaced the center resonator with a resonated magnaflow x-pipe and then straight pipes to the stock mufflers. Made the car sound 100% better, sounds super close to stock when cruising but when you start to give it some gas WOW!.

I second this, think the car sounds perfect this way for a daily. My shop replaced w/ xpipe and just put in a section of stainless all the way back to mufflers rather than patching in the two small sections.

For clarity sake, you modified your exhaust as vdubz's photo at post #1699 illustrates, correct?

[bayonet14]

I second this, think the car sounds perfect this way for a daily. My shop replaced w/ xpipe and just put in a section of stainless all the way back to mufflers rather than patching in the two small sections.

What diameter SS pipe did you go? I am looking to move my non res x-pipe forward in place of the down pipe oem resonators - replace the center w/a resonated - and run 2.25 dia SS full length

[Polo77]

Does anyone have any videos of an exhaust that has the resonator Deleted on the down pipes and the centre resonator replaced with an x pipe to the stock mufflers?

Section 1 and section 2 deleted but section 2 replaced with x pipe?



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[Works2shoot]

What diameter SS pipe did you go? I am looking to move my non res x-pipe forward in place of the down pipe oem resonators - replace the center w/a resonated - and run 2.25 dia SS full length

I PMed Magnaflow on here and they said to buy the 2.5" diameter 11386 resonated downpipe vs the 2.25" diameter 11385 downpipe for installation reasons. Basically the 2.5 will slide over our car's existing 2.25" piping and allow for easier welding.

[EIAlfonso]

I did the baby res ---> Resonated Xpipe
Center Res ----> Straight pipes

Good sound, a little loud when pulling from 2K up at slow speeds in the top gears (ie 7th gear at 45 mph). I was on the fence about putting the baby res in place of the center res, has anyone done this?
In other words instead of straight pipes in the center section just reuse the baby res in the location were the large resonator was removed?

[Polo77]

I did the baby res ---> Resonated Xpipe
Center Res ----> Straight pipes

Good sound, a little loud when pulling from 2K up at slow speeds in the top gears (ie 7th gear at 45 mph). I was on the fence about putting the baby res in place of the center res, has anyone done this?
In other words instead of straight pipes in the center section just reuse the baby res in the location were the large resonator was removed?

Please post up a video of this! Some drive by's and revs from the outside! Thanks


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[Loe]

Here are a few:

Resonated X-pipe replaced the baby resonators
Center resonator replaced with straight pipes
OEM mufflers

There is some drone in the 2,000-2,500 range, but nothing drastic/crazy or annoying.

Listen with ear phones. The second video is broken in.




Ever since I went with a HFC set-up, exhaust noise increased 20-folds, but man did that cold-start sound wonderful! Downside is the drone and extra raspiness, I've been needing to get rid of the extra drone/raspy sound. I did just that (drone is 98% eliminated) by adding another resonated X-pipe where the center resonators are. The exhaust note sounds slightly hollow now (less bassy, which rid of 98% of the drone, its virtually silent in that range inside the car until you open the window), but more growly, with a hint of resonance, maybe even strange-sounding as the howl/growl combination around 2,000-2,500rpm and again in the 3,000-3,300rpm is a hollow, yet loud sounding thing, sorta rings the ear drums with the windows down, yet never drones inside the cabin), hard throttle openings opens up the exhaust substantially too. Hard to explain, but I will try to capture the exterior exhaust note this weekend with a video.

[jimrobbington]

Here are a few:

Resonated X-pipe replaced the baby resonators
Center resonator replaced with straight pipes
OEM mufflers

There is some drone in the 2,000-2,500 range, but nothing drastic/crazy or annoying.

Listen with ear phones. The second video is broken in.




Ever since I went with a HFC set-up, exhaust noise increased 20-folds, but man did that cold-start sound wonderful! Downside is the drone and extra raspiness, I've been needing to get rid of the extra drone/raspy sound. I did just that (drone is 98% eliminated) by adding another resonated X-pipe where the center resonators are. The exhaust note sounds slightly hollow now (less bassy, which rid of 98% of the drone, its virtually silent in that range inside the car until you open the window), but more growly, with a hint of resonance, maybe even strange-sounding as the howl/growl combination around 2,000-2,500rpm and again in the 3,000-3,300rpm is a hollow, yet loud sounding thing, sorta rings the ear drums with the windows down, yet never drones inside the cabin), hard throttle openings opens up the exhaust substantially too. Hard to explain, but I will try to capture the exterior exhaust note this weekend with a video.

Wait, so you have 2 xpipe now or by having the HFCs installed, you lost your first xpipe?

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[theweebabyseamus]

Here are a few:

Resonated X-pipe replaced the baby resonators
Center resonator replaced with straight pipes
OEM mufflers

There is some drone in the 2,000-2,500 range, but nothing drastic/crazy or annoying.

Listen with ear phones. The second video is broken in.




Ever since I went with a HFC set-up, exhaust noise increased 20-folds, but man did that cold-start sound wonderful! Downside is the drone and extra raspiness, I've been needing to get rid of the extra drone/raspy sound. I did just that (drone is 98% eliminated) by adding another resonated X-pipe where the center resonators are. The exhaust note sounds slightly hollow now (less bassy, which rid of 98% of the drone, its virtually silent in that range inside the car until you open the window), but more growly, with a hint of resonance, maybe even strange-sounding as the howl/growl combination around 2,000-2,500rpm and again in the 3,000-3,300rpm is a hollow, yet loud sounding thing, sorta rings the ear drums with the windows down, yet never drones inside the cabin), hard throttle openings opens up the exhaust substantially too. Hard to explain, but I will try to capture the exterior exhaust note this weekend with a video.

I feel like Im reading the descriptions during wine tasting. I halfway expected to read "smooth and soft, with an almost toffee note"

[Jeffklop]

https://youtu.be/t5V7WycNkvY

Here is mine. Resonated x in place of baby resonators, straight piped center resonator, and stock mufflers.


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[abamfo]

Here are a few:

Resonated X-pipe replaced the baby resonators
Center resonator replaced with straight pipes
OEM mufflers

There is some drone in the 2,000-2,500 range, but nothing drastic/crazy or annoying.

Listen with ear phones. The second video is broken in.




Ever since I went with a HFC set-up, exhaust noise increased 20-folds, but man did that cold-start sound wonderful! Downside is the drone and extra raspiness, I've been needing to get rid of the extra drone/raspy sound. I did just that (drone is 98% eliminated) by adding another resonated X-pipe where the center resonators are. The exhaust note sounds slightly hollow now (less bassy, which rid of 98% of the drone, its virtually silent in that range inside the car until you open the window), but more growly, with a hint of resonance, maybe even strange-sounding as the howl/growl combination around 2,000-2,500rpm and again in the 3,000-3,300rpm is a hollow, yet loud sounding thing, sorta rings the ear drums with the windows down, yet never drones inside the cabin), hard throttle openings opens up the exhaust substantially too. Hard to explain, but I will try to capture the exterior exhaust note this weekend with a video.

So you used a resonated x pipe, can you provide some details?? Good to see your drone issue is gone

[Works2shoot]

So you used a resonated x pipe, can you provide some details?? Good to see your drone issue is gone

What details do you need, the part number? That's a few posts back.

[Loe]

Wait, so you have 2 xpipe now or by having the HFCs installed, you lost your first xpipe?

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So you used a resonated x pipe, can you provide some details?? Good to see your drone issue is gone

Right now my set-up is:

JHM HFC
Magnaflow 11835 resonated X-pipe replaced the baby resonators
Magnaflow 11835 resonated X-pipe replaced the center resonators
stock everything

yes, I have two resonated X-pipes now. I'll try to capture a video of it, but it's less bassy at low throttle settings than before, but still louder during higher throttle situations due to the introduction of the HFC over OEM cats. Sound quality changed (higher octave, less bassy, slight hollow resonance/growl), and sound quantity increased with very little if any drone. It sounds slightly strange having a growl that's not bassy though...so it's not for everyone, a close friend of mine whos ridden in my car says its unusual sounding, especially when it rings your ears at certain rpm ranges lol.

[theweebabyseamus]

I wonder why HFCs would make that big of a difference. Maybe because they're so close to the heads relative other cars?

[miztahsparklez]

I wonder why HFCs would make that big of a difference. Maybe because they're so close to the heads relative other cars?

Less material to "filter" the noise. My car is extremely loud.


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[abamfo]

Right now my set-up is:

JHM HFC
Magnaflow 11835 resonated X-pipe replaced the baby resonators
Magnaflow 11835 resonated X-pipe replaced the center resonators
stock everything

yes, I have two resonated X-pipes now. I'll try to capture a video of it, but it's less bassy at low throttle settings than before, but still louder during higher throttle situations due to the introduction of the HFC over OEM cats. Sound quality changed (higher octave, less bassy, slight hollow resonance/growl), and sound quantity increased with very little if any drone. It sounds slightly strange having a growl that's not bassy though...so it's not for everyone, a close friend of mine whos ridden in my car says its unusual sounding, especially when it rings your ears at certain rpm ranges lol.

Thanks Loe - do you mean 11385 (4 x 9 oval muffler with x pipe in the middle @ 2.25")? I couldn't find that part number is all

[theweebabyseamus]

Less material to "filter" the noise. My car is extremely loud.


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No I mean I understand the concept, it's just that HFCs don't make that big of a difference on most platforms. Louder, sure, but not a dramatic increase.

[Jeffklop]

Thanks Loe - do you mean 11385 (4 x 9 oval muffler with x pipe in the middle @ 2.25")? I couldn't find that part number is all

11385 is the part number that I used and I think everyone else as well.


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[Loe]

Thanks Loe - do you mean 11385 (4 x 9 oval muffler with x pipe in the middle @ 2.25")? I couldn't find that part number is all

Yes correct, I mistyped it

[perlibu]

here is my new setup. without xpipe, so is offtopic, sry about this. But i thought i show you this setup.
Stock babies resonators
stock center resonator
stock mufflers, but modified.
complety exhaust system look like original, but just the mufflers are modified inside.
https://www.youtube.com/watch?v=h6gi4qzTgzs

[Polo77]

here is my new setup. without xpipe, so is offtopic, sry about this. But i thought i show you this setup.
Stock babies resonators
stock center resonator
stock mufflers, but modified.
complety exhaust system look like original, but just the mufflers are modified inside.
https://www.youtube.com/watch?v=h6gi4qzTgzs

Did you do something like a muffler bypass? Or a twin loop delete? Could you please show pictures of what you did? Thanks


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[Loe]

Listen with ear-phones, the Go-Pro doesn't capture higher frequencies very well.

Set-up

JHM HFC
Magnaflow resonated X-pipe replaced baby mufflers
Magnaflow resonated X-pipe replaced center resonator
OEM mufflers

You can hear that awesome-yet strange sounding high-pitched zingy-pingy, howl-growl, hollow-loud sound (doesn't capture well on the Go-Pro, but it rings your ears inside the car with the windows down), almost sounds like gear-whine, but emanating from the exhaust between :44 - 1:00 in the video. Also at low RPM, there isn't a bassy growl, just a higher pitched growl (hence no drone, awesome! :) ) but gets louder as I rev beyond 2,500rpm and beyond the drone area. Loving it so far, the HFC adds a zingy-pingyness to the exhaust similar to an E46 M3 exhaust note without the buzzy sound.

To answer another question on why the HFC adds volume, they have less substrate, and the cats are 1/2 the size in width and length over the OEM cats.

[perlibu]

i give the mufflers to a guy in germany. He dont show what he do. But he said he made a new muffler inside.

[miztahsparklez]

My "quiet" exhaust....


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[ntsantos]

My "quiet" exhaust....


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I was hoping someone would do that. Loud with little drone?

[Victor Newman]

Just ordered my Magnaflow 11385, two Vibrant 3" tips, and two Vibrant 3.5" tips. So excited

[miztahsparklez]

I was hoping someone would do that. Loud with little drone?

It's interesting. I think I didn't quite calculate for temperature and the speed of sound. As my car gets warm, the sound definitely changes.

The car is significantly quieter when it's cold. The drone isn't 100% gone as a result when warmed up. I may decide to cap it shorter to see if there's a change in sound for the higher frequencies. The alternative is to somehow add length to the cap to accommodate for the speed of sound change with temperature.

On another note, my car sounds like a race car still lol...


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[KRp220]

hey guys. hoping you can provide me some insight...

i had an AWE track exhaust, but the drone was just getting to be too much and i was itching for a change anyway.
i went to the local muffler shop and had 2 mufflers installed along with some new tips. the drone was immediately reduced and almost eliminated entirely
the sound was OK but it was far too tame coming from the AWE track exhaust, so i went back and had the two baby resonators removed from the stock downpipes. it now sounds awesome but the drone is arguable worse the the track exhaust

in summary: stock downpipes with the resonators removed, AWE center muffler, then 2 Magnaflow mufflers in the back. This is a similar setup to AWE's touring + non res downpipes or Borla's system

The drone is bad and i'm hoping someone and provide me some insight on how to reduce it. Based on what i've heard about the AWE and Borla's systems, the drone isn't that bad, so i don't know why mine would be. thanks in advance

[ModItNow]

hey guys. hoping you can provide me some insight...

i had an AWE track exhaust, but the drone was just getting to be too much and i was itching for a change anyway.
i went to the local muffler shop and had 2 mufflers installed along with some new tips. the drone was immediately reduced and almost eliminated entirely
the sound was OK but it was far too tame coming from the AWE track exhaust, so i went back and had the two baby resonators removed from the stock downpipes. it now sounds awesome but the drone is arguable worse the the track exhaust

in summary: stock downpipes with the resonators removed, AWE center muffler, then 2 Magnaflow mufflers in the back. This is a similar setup to AWE's touring + non res downpipes or Borla's system

The drone is bad and i'm hoping someone and provide me some insight on how to reduce it. Based on what i've heard about the AWE and Borla's systems, the drone isn't that bad, so i don't know why mine would be. thanks in advance

I would contact awe and see if you could purchase the rear muffler section from them. It would eliminate all your problems, those mufflers are meant too cancel out drone.


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[KRp220]

I would contact awe and see if you could purchase the rear muffler section from them. It would eliminate all your problems, those mufflers are meant too cancel out drone.


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do you think there will be a huge difference between the AWE mufflers and the magnflow mufflers?
the magnaflow mufflers reduced drone, and the drone only came back after I took out the baby resonators

[Victor Newman]

[PenttisHSR]

Just ordered my Magnaflow 11385, two Vibrant 3" tips, and two Vibrant 3.5" tips. So excited

If it drones, you need to do this (1/4 Wave Resonator Tube)..

[ModItNow]

do you think there will be a huge difference between the AWE mufflers and the magnflow mufflers?
the magnaflow mufflers reduced drone, and the drone only came back after I took out the baby resonators

I think the main difference is AWE has done a ton of r&d on this platform so they are tuned specially for our cars. Certainly magnaflow will be much cheaper but you risk getting sub par results in comparison.


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[audistealth]

Listen with ear-phones, the Go-Pro doesn't capture higher frequencies very well.

Set-up

JHM HFC
Magnaflow resonated X-pipe replaced baby mufflers
Magnaflow resonated X-pipe replaced center resonator
OEM mufflers

You can hear that awesome-yet strange sounding high-pitched zingy-pingy, howl-growl, hollow-loud sound (doesn't capture well on the Go-Pro, but it rings your ears inside the car with the windows down), almost sounds like gear-whine, but emanating from the exhaust between :44 - 1:00 in the video. Also at low RPM, there isn't a bassy growl, just a higher pitched growl (hence no drone, awesome! :) ) but gets louder as I rev beyond 2,500rpm and beyond the drone area. Loving it so far, the HFC adds a zingy-pingyness to the exhaust similar to an E46 M3 exhaust note without the buzzy sound.

To answer another question on why the HFC adds volume, they have less substrate, and the cats are 1/2 the size in width and length over the OEM cats.

Did you have to get a HFC tune for that, or is there enough compensation in APR or GIAC to accommodate? Also, do you recall the cell count or type of cat (metallic)?

EDIT: 2 x-pipes?

[EIAlfonso]

i decided to paint the welds with ceramic header paint
I hope this will delay any corrosion of the welds

[mjwolff35]

Has anyone ever tried opening up the center resonator?
I've been searching Google images looking for a picture of it cut open, but can't find anything.
I know modifying the factory muffler on the E9X bimmers is pretty popular and the results sound great.

The video below shows how they modify it.
https://www.youtube.com/watch?v=w3x7aSSAd0I

The video below shows how it sounds before and after.
https://www.youtube.com/watch?v=qhn4NOe8z5s

I'm thinking the same principles can be applied to the center resonator but I haven't seen it done yet.

[XxSullyxX123]

Has anyone ever tried opening up the center resonator?
I've been searching Google images looking for a picture of it cut open, but can't find anything.
I know modifying the factory muffler on the E9X bimmers is pretty popular and the results sound great.

The video below shows how they modify it.
https://www.youtube.com/watch?v=w3x7aSSAd0I

The video below shows how it sounds before and after.
https://www.youtube.com/watch?v=qhn4NOe8z5s

I'm thinking the same principles can be applied to the center resonator but I haven't seen it done yet.

I had wondered the same about this in the past.


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[bayonet14]

I PMed Magnaflow on here and they said to buy the 2.5" diameter 11386 resonated downpipe vs the 2.25" diameter 11385 downpipe for installation reasons. Basically the 2.5 will slide over our car's existing 2.25" piping and allow for easier welding.

Nice....thanks!

[mjwolff35]

For all the people with their center resonator lying around, would any of you be willing to cut it open for show and tell.