View Full Version : 3" exhaust tone....

11-25-2006, 05:43 PM
I have the GTRS setup with borla currently, and have decided to go with a 3" setup for better flow... I like the sound of my borla (w/ test pipe) a lot, but from what I hear, its just not enough to spool the GTRS efficiently. I was wondering how I may go about keeping the same exhaust tone when I go 3", i dont want my dd to be too obnoxious.

11-25-2006, 09:38 PM
keep your muffler, and theres noway a 3" wont be obnoxiously loud

11-25-2006, 09:55 PM
A custom 3" with big resonator and big muffler would do it. I've been spending time on the Subaru boards and they have 4 different 3" exhausts to choose from. Two are very loud and two are stealth. If they can move that much air quietly then so can we. Choosing the right components to do it is the trick.

11-25-2006, 10:00 PM
Originally posted by maxspeed
keep your muffler, and theres noway a 3" wont be obnoxiously loud

I disagree. the thing is that until recently, there's been little to no market for a 3" system for our cars. it's just now with the popularity Elims and BT's (all due to our cars becoming more accessible) that we're seeing a need for a 3" option.

11-26-2006, 08:29 AM
how about a cut out?

11-26-2006, 01:32 PM
^Cut out? could you possibly elaborate? Does anybody know how much I should expect to pay for a custom cat-back exhaust? I am expecting around 600, but I would like to find out before I put my borla up for sale.

11-26-2006, 01:36 PM
^you can usually get a 3" mandrel bent turbo back exhaust with a magnaflow for around $500ish, give or take 100. just depends on the shop

11-26-2006, 03:38 PM
Sherpa ran a full 3" system and used a Magnaflow muffler in place of the resonator. There was another Magnaflow muffler in the standard location. He said it was quiet for what it was. That is open to interpretation but is still promising.

You could always just measure to see what size mufflers will fit. Then call Magnaflow and ask for help getting the right combination to get you low noise and high flow. This is my plan when I ever get around to it. I've been looking at Aeroturbine mufflers and resonators but again, haven't yet purchased anything.

I am also planning on cutting off the downpipe flanges and the cat flanges and running v-band clamps. That should make future maintenance a lot easier.

11-26-2006, 04:47 PM
^yeah, once i go custom im defiantely doing v-band clamps on as many places as i can between the turbo and lower downpipe flange

11-26-2006, 09:55 PM
This looks nice:
3" stealth muffler:

3" Resonator:

This is the other setup I've been looking at. Either with or without the tip. I've been thinking that some very simple tips or maybe even a black downturn would be more stealthy.

Assuming it would be a good fit I would run a cat like this one. Although I haven't gotten to the measurement point of planning I'd bet that making a downpipe that includes the cat with a V band at the turbo and by the transmission would make things the easiest in the long run. Then I could just remove two clamps and two or three O2 sensors and the whole thing would come out as a unit.

I'd bet that this catted 3" turbo back system would have less restriction/backpressure than a Borla or Neuspeed cat back with a test pipe. That is my hunch anyway.

11-27-2006, 01:32 PM
OneMoreMile, thank you very much for your very informative response. I like the idea of a near stock exhaust coupled with a not-so-stock turbo. The only downsides I see to having one of these setups would be the lack of selection and styling of tips.

11-28-2006, 09:13 AM
That depends on what look you want. I keep thinking that the larger the turbo the quieter the look. I'll probably just get a flat black downturn so it looks like the muffler cutout is empty. That or a pair of black Monza style tips. If you look around you should be able to find plenty of tips with a 3" inlet.

11-28-2006, 09:37 AM
any idea when you will be pulling the trigger on all of this? It will probably be 1.5 months for me since I am dealing with the warrenty on my blown GTRS right now...

12-10-2006, 03:39 PM
i got mine at a place that does mandrel bends in fremont. cost about 450 if i can recall? 3inch is extremely loud by the way even with a couple resonators:)

12-12-2006, 11:08 PM
any idea when you will be pulling the trigger on all of this? It will probably be 1.5 months for me since I am dealing with the warrenty on my blown GTRS right now...

I won't be doing it for a while. I haven't really gotten into the turbo upgrades or anything yet. [:D]

Here are a couple that look good. I don't know what will and won't fit under the back of the car but something like this with a good resonator and sound won't be a problem.


12-13-2006, 08:20 AM
Make sure you buy good mufflers, I had 2 straight thru Magnaflows on my 3" turboback and it annoyed the piss out of me it was so loud. Now I'm running 3" all the way back to an S4 muffler, nice and quiet [:)]

12-13-2006, 08:23 AM
^you arent running any resonator or anything? Where did you get the s4 muffler?

12-13-2006, 08:26 AM
Oops, I still have my straight thru Magnaflow resonator. I got the S4 muffler free from my mechanic after he upgraded exhaust on someone's S4.

12-13-2006, 09:36 AM
The Aero products are used on Nascar and Grand Am cup cars so quality isn't really an issue. They have a stealth series which is what I posted above.

12-13-2006, 10:26 AM
b5 s4 muffer is ~2.5" inlet

12-13-2006, 10:36 AM
S4 is seriously quiet too. That thing sounds like its always half asleep.[cool]

12-13-2006, 12:36 PM
i have a magna flow 3" and my cars still pretty loud. im running test pipe too sooo