Custom exhaust question.

Reply Subscribe

Thread Tools

Search this Thread

Apr 25, 2006 | 02:58 PM

HugeTTs

Thread Starter

AudiWorld Senior Member

Joined: Dec 2005

Posts: 1,018

Likes: 0

Custom exhaust question.

I've seen a few exhaust threads that sink pretty quick.

I want to sum up and make a good call here pretty soon.

First with some questions...

*After the cat, what is the best diameter piping to go with.

*Is there a way to do the duals without having a T in the exhaust (I've heard T's are bad news, they slow down the flow, correct me if I'm wrong)

*If I were to go with the most used size (2.5 or 3 inch I'm assuming, we will see the consensus once this thread has a little exposure) what can expect to hear everyday when I'm drving, will it be insaaanely loud, or just loud under acceleration?

*Would the use of an aftermarket resonator be a good idea to chill the flow down a little?

*Can I use my stock tips?

I put custom 2.75 inch piping on my Triumph TR6, headers straight straight into a flowmaster 40 series muffler. It was simple, one pipe to mess with and a muffler.

Here I'm dealing with duals and the unknown land of turbo cars... so I need your help!

Thanks again guys. I'm learning ALOT here.
-Chip

Apr 25, 2006 | 03:12 PM

nikhil

AudiWorld Super User

Joined: Apr 2001

Posts: 8,025

Likes: 0

some answers

i don't think there's a 'best' diameter for a cat-back system. some have gone with 2.75" while others choose 3". by a "T" in the exhaust, do you mean that the single pipe is splitting into the duals at a 90* junction? I think a "Y" in the pipe would be a better design for flow reasons, but I'm just speculating.

I had my cat-back system on the car for a couple weeks w/o a resonator, and honestly it was far too loud for me. Consequently, I added a fairly small resonator, which has helped a lot. I might change that resonator out for something a bit bigger to further dampen the sound a bit, but we'll see how it goes...

My current setup is pretty loud when accelerating but isn't all that loud when just cruising, although certain RPMs can be a bit annoying with the windows up.

You could use your stock tips, but bigger tips look much nicer :-)

i hope that helps a bit.

Apr 25, 2006 | 03:35 PM

HugeTTs

Thread Starter

AudiWorld Senior Member

Joined: Dec 2005

Posts: 1,018

Likes: 0

Perfect, another question

Perfect.

So, I do a y pipe, and go with 3 inch pipe.

Would this be a good choice for a car with the GIAC 91 program?

I will pretty much be stock except for suspension/brake mods. The 91 program would be the only thing to increase engine performance.

Yay or nay on the 3 inch.

Which sounds better, that's what I'm most concerned with.