Exhaust to boomy and loud

[Jonas_R]

So I think I'm getting old, but my exhaust is driving me crazy since it is makes to much noise and it is also to boomy at 3000 RPM.

It is 3" turbo back SS exhaust with cat, and a muffler at the middle from siemens and also rear muffler from borla.

I was thinking that I could go 2.5" or 2.75" over the rear diff since I think it is touching there, but will that make it more quite?

[Rocco]

you are getting old Jonas


i am very happy with my 3" direct sistem with no cats and no intermediate silencer,only a straight pipe to the OEM rear silencer. it is not too loud and seems to work perfectly

[Jonas_R]

Yeah perhaps it is the borla free flowing exhaust that is the problem Anyhow it is way to noisy and it is driving me crazy.

[Bram]

I had 2 Borla silencers in my old 3" exhaust system and also found it too loud. And yes I am getting old too

[Ross]

Same here, 3" system Borla boxes on my S2 Avant and that was too loud... worst at 3k which was cruising speed! Scorpion is much better, bit of boom around 2.5-3k which is fine for me but a little more (85mph) and it's silent.

Dropping it to 2.75" I'm sure will help, but I think changing the boxes would be the way to go.

[Jonas_R]

I was considering getting a Simons 045-B91R rear muffler has 2.75 inch pipe, but not sure if it will help. Running a Simons muffler a the middle.

[newsh]

My coupe is too noisy, same story, 034 3" turboback system with one small back box, I tried to order it with the big back box with the twin outlets but the order got messed up, I've added a small centre box from Jetex which helped a bit but it still booms, way too loud for the track too so have run a muffler on the tail pipe which messes up the power..

[Jonas_R]

Yeah I got the 034 rear muffler with twin pipes but it is still loud as hell. I think I will try the Simons rear muffler and see if that helps on the loudness.

[Torben.E.]

Hi Jonas

are your simons by any chance the round stainless ones, i made a stainless 3" with 3 round 3" simons, loud as hell, put on stock backbox, silent as a mouse.

[JP]

Was going to fit stock backbox back on mine and use an exhaust bypass for the times I'm on wot. As again that 3000rpm cruising starting to do my head in after 15+yrs.

[Torben.E.]

Stock backbox is not as bad as you could fear, it is at dual fullflow design with only a 30 degree bend in it (on a urs4)

[Jonas_R]

Hi Jonas

are your simons by any chance the round stainless ones, i made a stainless 3" with 3 round 3" simons, loud as hell, put on stock backbox, silent as a mouse.

Hi Torben,

Running one round 3" Simons muffler as the middle section.

As rear box I have a Borla muffler, I believe this one to be the main problem.

[sam80quattro]

with all you old folks complaining about 3" system you'd think id be able to find a cheap 1 for sale lol

[Jonas_R]

Yeah you should think so

[Jonas_R]

Anyhow what are my options:

1.
Simons 2.75" rear muffler and over the rear diff in 2.75

2.
Fox 2.75 Type 13 rear muffler and 2.75 over the rear diff.

3.
Stock rear muffler?

Anybody using any of the solutions?