Exhaust Flow - Honda Prelude Forum

MtangKlr · 05-30-2007, 01:16 PM

When you building your own down pipe, I understand bigger is better for turbo response. I already have a 2.5" cat-back exhaust on the car will having a 3" down pipe that reduces to 2.5" at the cat flange make a difference or should I just keep it all one size??

Dfwbb6 · 05-30-2007, 02:23 PM

Quote:

Originally Posted by MtangKlr

When you building your own down pipe, I understand bigger is better for turbo response. I already have a 2.5" cat-back exhaust on the car will having a 3" down pipe that reduces to 2.5" at the cat flange make a difference or should I just keep it all one size??

3" all the way works best but some setups to go 3in to 2.5in Dyno would ofcourse give u proven results.....im planning on 3in all around tho!

Artifex · 06-01-2007, 09:16 PM

Quote:

Originally Posted by MtangKlr

When you building your own down pipe, I understand bigger is better for turbo response. I already have a 2.5" cat-back exhaust on the car will having a 3" down pipe that reduces to 2.5" at the cat flange make a difference or should I just keep it all one size??

Run the largest downpipe you can fit. You will see an improvement, even with a cat-back of 2.5".