GOLDBERG

is 2.25, 2.5 or 3 inch best??this would be on my civic hatch..98 dx daily driver, t3 boostin at 9psi..i was thinking 2.5 but what would be disadvantages/negative effect of getting a pipe too big like a 3 inch?

GSRrR

dis: turbo spooling to fast.

Well you are more prone to have boost spikes. Not if you have a nice manifold though. What kind do you have?

GOLDBERG

gettin either a 92-95 cx manifold or a crx hf manifold...exaust manifold you are talking about,right?

texan

It's hard to go too big on a turbo setup, but it's easy to go too small. The standard NA exhaust pressure/velocity theory doesn't really apply AT ALL to turbo motors, basically the bigger the exhaust pipe (within reason), the more likely the whole system will perform to maximum potential. 2.5" is good, 3" is better.

Ps- Boost spikes are found through bad wastegate selection/placement/management. Not exhaust pipe diameter. Getting gasses out efficiently is never a bad thing.

GOLDBERG

awesome.....so 3 inch after thw downpipe then.. 2.5inch downpipe?

texan

3" complete. Make the downpipe the same di as the rest of the exhaust.

GOLDBERG

can anyone direct me too somewhere i can buy a universal muffler with a 3 inch inlet???all i can find is 2.5 inch

RGAZ

Here.

http://www.dynomax.com

I recommend the Ultra-flow for a turbo app. I have one and it sounds sweet.

Buy it through Summit racing.

Randy

Hammett

Apexi N1 turbo app.