Best route to eliminate drone and rasp on catless/res delete

[Morritse]

I have gutted stock cats and an 034 resx xpipe. After gutting the cats, the rasp became too much at high RPMs and the drone is annoying.

Talked to a muffler shop yesterday, he really wasn't sure what to do, as he hasn't seen this situation before. Have any of you had success eliminating these unwanted sounds in similar setups?

I'm not trying to drop $1,500 on a catback, I think the desired results can be accomplished by splicing in a certain resonator somewhere in the system. Question is, where and which.

[SGR]

Where is your x-pipe placed? And just to be clear, what on your exhaust remains OEM?


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[GandalfTheIbis]

I am running a milltek valvesonic catback. In my experience adding the optional center resonator was helpful in mitigating some of the drone. I've also seen guys suggest that the AWE resonated downpipes help cut the drone, so MAYBE there's a trend in keeping as much resonation as possible close to the engine.

[miztahsparklez]

I am running a milltek valvesonic catback. In my experience adding the optional center resonator was helpful in mitigating some of the drone. I've also seen guys suggest that the AWE resonated downpipes help cut the drone, so MAYBE there's a trend in keeping as much resonation as possible close to the engine.

I think I'm going to swap the x pipe for the resonator... The rasp sucks on my valvesonic.

Drone I don't mind. That is fixed by changing the opening of the valve rpm. But sounding like a Honda Civic is terrible.


Do you mind recording a video of your exhaust? I either have a terrible leak that makes my car sound cheap, or I just need to put the resonator back in.

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[GandalfTheIbis]

Are you catless? I installed hi flow cats and the milltek valvesonic at the same time and there was definitely some rasp... then a couple weeks ago my cats melted so I’m now running test pipes and added the center resonator on the same day. Valve open is very fart can like especially at lower RPM’s like 2400-3200 ish sounds awful with rasp and the valve open. Closing the valve makes it a bit better but still I hate the raspy frequency down low. Driving on the highway light acceleration in 6th or 7th from 85mph makes the worst noise. I usually downshift to 5th and hit it from there just to avoid the noise.

I have some revving, launching, and in cabin sound clips I can email you of my setup pre-gutting and resonating. Send me a message with your email address if you want those.

I don’t have anything of the current setup yet but the plan is to record similar clips.


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[miztahsparklez]

Are you catless? I installed hi flow cats and the milltek valvesonic at the same time and there was definitely some rasp... then a couple weeks ago my cats melted so I’m now running test pipes and added the center resonator on the same day. Valve open is very fart can like especially at lower RPM’s like 2400-3200 ish sounds awful with rasp and the valve open. Closing the valve makes it a bit better but still I hate the raspy frequency down low. Driving on the highway light acceleration in 6th or 7th from 85mph makes the worst noise. I usually downshift to 5th and hit it from there just to avoid the noise.

I have some revving, launching, and in cabin sound clips I can email you of my setup pre-gutting and resonating. Send me a message with your email address if you want those.

I don’t have anything of the current setup yet but the plan is to record similar clips.


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I'm catless now, but running the x pipe instead of the front resonator/silencer.

Strangely enough, once the car is warm/hot, the fart can noise goes away... I need to figure out what the heck is happening.

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[SGR]

I have gutted stock cats and an 034 resx xpipe. After gutting the cats, the rasp became too much at high RPMs and the drone is annoying.

Talked to a muffler shop yesterday, he really wasn't sure what to do, as he hasn't seen this situation before. Have any of you had success eliminating these unwanted sounds in similar setups?

I'm not trying to drop $1,500 on a catback, I think the desired results can be accomplished by splicing in a certain resonator somewhere in the system. Question is, where and which.

https://youtu.be/Rm_SUBPx4l4

Check out my setup, revs and such in the video. Becker test pipes, followed by magnaflow 11385 resonated x-pipe in place of baby resonators. The magnaflow is a hundred bucks. Stock center resonator and stock mufflers. Zero drone.


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[VNA4]

https://youtu.be/Rm_SUBPx4l4

Check out my setup, revs and such in the video. Becker test pipes, followed by magnaflow 11385 resonated x-pipe in place of baby resonators. The magnaflow is a hundred bucks. Stock center resonator and stock mufflers. Zero drone.


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How loud is it Cruising mode?
How's the smell.
Do you have other videos?


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[SGR]

How loud is it Cruising mode?
How's the smell.
Do you have other videos?


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Cruising mode is pretty low-key from the outside when you aren’t accelerating, i.e., cruising. You can tell it’s not stock, though, but it is remains fairly under the radar. As for accelerating, see below:

https://youtu.be/h2S-mfxbeTU

https://youtu.be/kCMBKtUOl7Y

If interested, I can get an in cabin cruising video clip tomorrow.


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[Morritse]

https://youtu.be/Rm_SUBPx4l4

Check out my setup, revs and such in the video. Becker test pipes, followed by magnaflow 11385 resonated x-pipe in place of baby resonators. The magnaflow is a hundred bucks. Stock center resonator and stock mufflers. Zero drone.


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Sounds really nice actually. Wish I still had my stock center piece

[SGR]

Sounds really nice actually. Wish I still had my stock center piece

You could probably find one at a euro car performance shop in their recycle pile. Every time I’m at my shop, there are always stock S4 and/or S5 exhaust systems sitting there from the last guy who got an AWE put on lol.


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[VNA4]

Sounds meaning but smooth !


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[VNA4]

Cruising mode is pretty low-key from the outside when you aren’t accelerating, i.e., cruising. You can tell it’s not stock, though, but it is remains fairly under the radar. As for accelerating, see below:

https://youtu.be/h2S-mfxbeTU

https://youtu.be/kCMBKtUOl7Y

If interested, I can get an in cabin cruising video clip tomorrow.


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How's the smell? I have two kids that's the family ride lol


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[GandalfTheIbis]

I'm catless now, but running the x pipe instead of the front resonator/silencer.

Strangely enough, once the car is warm/hot, the fart can noise goes away... I need to figure out what the heck is happening.

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My fart can noise improves significantly once the exhaust heats up as well, and someone on the Facebook page echoed that earlier today as well. I think that’s normal.

And well, it’s the worst under lower rev, partial throttle conditions. Give the car a lot of gas and it usually revs up fast or downshifts and misses the worst of it.


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[$nooze]

Has anyone noticed pipe sizing to instigate more drone? I'm somewhat in the same boat as op. I have 3" to an x-pipe then straight back to flowmasters series 40's (on either side, respectively). My drone is cabin based and has that low frequency hum/ vibration within the 2400(ish range when cold; 2600 ish when warmed) to the under side of 3000rpms.

Im contemplating adding in two vibrant resonators pre x-pipe. As the sounds feels and seems to be coming from mid car within the cabin.

Does anyone else notice that the drone and sound is only noticeably from inside and not very existent from outside? I've been outside of my car listening through the rpms ranges and not heard the sounds that I hear when driving.

[SGR]

How's the smell? I have two kids that's the family ride lol


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Whoops, forgot to mention that before. I sometimes notice heavier exhaust smell with my test pipes when, 1) the windows are down, and 2) after a period of heavier acceleration, particularly on the highway. Seems to waft through the vents slightly, then fades away. However, I started noticing this before the test pipes, after I went intake, dual pulley, UC, etc. Just a little more pronounced now under the conditions I mentioned above.


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[Morritse]

Has anyone noticed pipe sizing to instigate more drone? I'm somewhat in the same boat as op. I have 3" to an x-pipe then straight back to flowmasters series 40's (on either side, respectively). My drone is cabin based and has that low frequency hum/ vibration within the 2400(ish range when cold; 2600 ish when warmed) to the under side of 3000rpms.

Im contemplating adding in two vibrant resonators pre x-pipe. As the sounds feels and seems to be coming from mid car within the cabin.

Does anyone else notice that the drone and sound is only noticeably from inside and not very existent from outside? I've been outside of my car listening through the rpms ranges and not heard the sounds that I hear when driving.

I'm doing exactly this today, I'll let you know how it works.

[waxxonMTL]

best way is to not cheap out with X-pipe and buy an AWE exhaust. proven result.

[tar]

best way is to not cheap out with X-pipe and buy an AWE exhaust. proven result.

Plus you get the benefit of tips that will pit, resonators that will fail, and a sweet weedwacker noise on occasion. And it only cost you 2k+ for a catback.

[GandalfTheIbis]

best way is to not cheap out with X-pipe and buy an AWE exhaust. proven result.

Meh, resonators that fail, exhaust that still sounds raspy and shitty to me once you install test pipes. Multiple thousands of dollars for results that are marginally better at best. Catback systems were designed with stock catalytic converters in place at a time when stage 2 was the most extreme setup.

All the cat back offerings on the market are antiquated.


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[tar]

Meh, resonators that fail, exhaust that still sounds raspy and shitty to me once you install test pipes. Multiple thousands of dollars for results that are marginally better at best. Catback systems were designed with stock catalytic converters in place at a time when stage 2 was the most extreme setup.

All the cat back offerings on the market are antiquated.


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Exhausts are rarely designed for Catless setups because in most states Catless is illegal and 90% of buyers won't be going Catless anyways.

[$nooze]

I'm doing exactly this today, I'll let you know how it works.

Great in for videos of cabin and outside if possible :) lol thanks

[GandalfTheIbis]

Exhausts are rarely designed for Catless setups because in most states Catless is illegal and 90% of buyers won't be going Catless anyways.

Ok, so maybe calling them antiquated is harsh... but this thread is still regarding a catless setup


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[VNA4]

Cruising mode is pretty low-key from the outside when you aren’t accelerating, i.e., cruising. You can tell it’s not stock, though, but it is remains fairly under the radar. As for accelerating, see below:

https://youtu.be/h2S-mfxbeTU

https://youtu.be/kCMBKtUOl7Y

If interested, I can get an in cabin cruising video clip tomorrow.


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Yes please in cabin cruising would be a decision factor to go with ur setup.

How does JHMs compare to yours btw? 034 recommends this

https://jhmotorsports.com/products/e...-4-2l-fsi.html


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[tar]

Ok, so maybe calling them antiquated is harsh... but this thread is still regarding a catless setup


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Ya I read that now I thought it was the other thread with almost exact same title that was started a day earlier than this thread.
But still if you read above your post that I quoted (post 19)you will see i said the exact same thing you did about the awe issues.

[GandalfTheIbis]

#sameteam


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[SGR]

Yes please in cabin cruising would be a decision factor to go with ur setup.

How does JHMs compare to yours btw? 034 recommends this

https://jhmotorsports.com/products/e...-4-2l-fsi.html


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The Becker test pipes are high quality, IMHO. Extremely solid and the TIG welds were very nicely done on mine (again, IMO).

I haven’t seen JHM’s test pipes physically to compare them, they’ve got a pretty good reputation though. As for their HFCs (if that’s what you were specifically referring to in the link you pasted), I’m sure they are great but I don’t have personal experience with them either. This is also comparing apples and oranges here. I have augmented my test pipes with a resonated x-pipe in place of the baby resonators, not test pipes in front of $1200 high-flow cat downpipes.

Honestly, if I could do this whole exhaust setup again (with using test pipes), I wouldn’t change a thing. The only thing I’ll be adding is new tips. Love the way it sounds, no drone, has the best of both worlds for a daily driver. Again, IMO.

Here’s a quick in cabin video I took today (I should note, soundaktor is still enabled).

https://youtu.be/f8UAMF9ouCs


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[VNA4]

Love it. Ima go with your setup, do you have the link to the exact product? (Test pipes + Magnaflow) . My setup already has X-pipe in place I believe (AWE Touring)

The Becker test pipes are high quality, IMHO. Extremely solid and the TIG welds were very nicely done on mine (again, IMO).

I haven’t seen JHM’s test pipes physically to compare them, they’ve got a pretty good reputation though. As for their HFCs (if that’s what you were specifically referring to in the link you pasted), I’m sure they are great but I don’t have personal experience with them either. This is also comparing apples and oranges here. I have augmented my test pipes with a resonated x-pipe in place of the baby resonators, not test pipes in front of $1200 high-flow cat downpipes.

Honestly, if I could do this whole exhaust setup again (with using test pipes), I wouldn’t change a thing. The only thing I’ll be adding is new tips. Love the way it sounds, no drone, has the best of both worlds for a daily driver. Again, IMO.

Here’s a quick in cabin video I took today (I should note, soundaktor is still enabled).

https://youtu.be/f8UAMF9ouCs


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[Morritse]

Love it. Ima go with your setup, do you have the link to the exact product? (Test pipes + Magnaflow) . My setup already has X-pipe in place I believe (AWE Touring)

He has the OEM center piece. If you go with the setup you're suggesting you're gonna drone a lot.

[Morritse]

Hey guys, after doing some research a couple things became apparent to me.

1) for a cat-less setup, you should not have the middle resonator deleted, if this is the case, you will drone no matter what

2) You should put the x pipe as far forward as possible.


As such, this is what I've decided to do. I'll let you guys know how it works, and post some sound clips after it's done.

[Morritse]

So. I ended up just replacing the baby resonators with the magnaflow part. The center piece is sill the same. Worked like a charm. I'll post audio when I get it.

[Morritse]

Here you go guys.

https://www.youtube.com/watch?v=Creq...ature=youtu.be

[melomandn]

Here you go guys.

https://www.youtube.com/watch?v=Creq...ature=youtu.be

I've gotten some really annoying rasp after putting on a Milltek x-pipe, sounds like a civic like someone mentioned above. Your car sounds just about perfect in that video.

So just to clarify, your setup is: gutted cats -> Magnaflow 11385 -> stock center res -> stock rear mufflers?

[Morritse]

I've gotten some really annoying rasp after putting on a Milltek x-pipe, sounds like a civic like someone mentioned above. Your car sounds just about perfect in that video.

So just to clarify, your setup is: gutted cats -> Magnaflow 11385 -> stock center res -> stock rear mufflers?

No center res. That's an x pipe (non resonated). I thought i would have to put resonators in there, but ended up not needing too.

[GandalfTheIbis]

I'm currently still finding my exhaust overly drone-y. I've exhausted the existing milltek parts catalogue but don't want to get rid of my milltek exhaust. I'm thinking I'll probably just live with my set-up for now, but I may look into having my milltek non resonated downpipe hacked into something a bit different down the road.

[Audiraz]

No center res. That's an x pipe (non resonated). I thought i would have to put resonators in there, but ended up not needing too.

My passenger side cat cracked. So I decided to replace with JHL test pipes. Now, between 2,000 - 4,000 rpm, it sounds like I riced out my car. My current setup:

JHL test pipes > stock down pipe > custom pipe > stock muffler

@Morritse, sounds like you have about the same set up. But now you are: magnaflow 11385 (x pipe) > 034 x pipe?

Your car sounds great! I want to duplicate it! Just not sure if I will achieve the same result, with test pipes, since you have gutted cats.


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[$nooze]

Here you go guys.

https://www.youtube.com/watch?v=Creq...ature=youtu.be

Sounds great, how's the drone/rasp between 2100 and 2900 rpms?

[Morritse]

My passenger side cat cracked. So I decided to replace with JHL test pipes. Now, between 2,000 - 4,000 rpm, it sounds like I riced out my car. My current setup:

JHL test pipes > stock down pipe > custom pipe > stock muffler

@Morritse, sounds like you have about the same set up. But now you are: magnaflow 11385 (x pipe) > 034 x pipe?

Your car sounds great! I want to duplicate it! Just not sure if I will achieve the same result, with test pipes, since you have gutted cats.


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You're correct about my setup. I would bet that installing the magnaflow part would fix your issues. It's not really a resonator, so it doesn't discriminate against specific frequencies too much. So I don't think the type of cats you have will effect it's characteristics too much.

[Morritse]

Sounds great, how's the drone/rasp between 2100 and 2900 rpms?

There isn't any rasp in that range whatsoever. I haven't had a chance to drive on a highway so I can't speak on drone, but it seems to be a lot less. The only thing I can complain about is a weird vibration at around 2k RPM. I think it's just a reasonance frequency of my system, but it isn't a big deal.

[SGR]

There isn't any rasp in that range whatsoever. I haven't had a chance to drive on a highway so I can't speak on drone, but it seems to be a lot less. The only thing I can complain about is a weird vibration at around 2k RPM. I think it's just a reasonance frequency of my system, but it isn't a big deal.

I can offer a suggestion on this as well — Myself and a hand few of others using the 11385 and various semi-custom setups installed these to help with the exhaust vibration. Really cuts it down quite nicely:

https://www.moparpartsgiant.com/part...2103612aa.html

You can clamp or weld them onto a couple of locations on the downpipes.


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