Hi!
I have 13B-re T61 turbo setup in JC Cosmo.
I made custom 4'' DP 5 years ago. And had stopped the project.
I try to continue now. Many things is done.
I shall to choose an exhaust system.
There are 3 pics (sorry for paint
It is mostly race car for weekend circuit track.
Witch pattern is best to choose for 500+ HP 19 psi of boost?
Thank you!

 

Simplicity... go with option #2.

 

I would use all the space you have. Something like 3.5" / 90mm from the turbo back, and then Y off into twin 2.5 back sections with large body 10" x 7" x 20" straight through mufflers if you can get something that large.

Anyone can make power, takes a smart design to make 500HP with no noise

I would also consider putting extra mufflers under the center of the car

 

If it's literally driven to and from a race track only, go with option 2. If it's driven on the street, go with option #3. I've got a couple reasons for this:

1) It's a Cosmo. It came with dual exit exhaust.

2) This is the basic configuration of the FC exhaust, and there are plenty of high horsepower FC's out there with dual exit exhaust.

 

Thank you for your opinions!

 

I agree with Arghx, I'd personally go with the single in most cases though. It will be louder but yield a bit more power. It's subjective I suppose.

 

#2 is also cheaper so you really win no matter what. Duals do look better on some cars but if it's just aesthetics it doesn't score high with me.

 

I agree with the above, but a 3.5" down to dual 2.5 - 2.75" should be quieter, and if your bumper has cut-outs for dual exhaust a single will look stupid. my 2c.

 

4" DP sound