Ive got an Integra LS that Im going to be boosting at 6-9 pounds. Im going to run a t3/t4 turbo. My DRAG intercooler inlet is 2" and the outlet is 2 3/8".

My question is what size piping do I need from the:
1.turbo to intercooler
2.intercooler to throttle body
3.downpipe
4.exhaust

Thanks in advance for the advice!

 

I would do 2" or 2.25" from turbo to i/c, 2.25" from i/c to t/b. 3" dp or 2.5" flared to 3" for a/c, and full 3" exhaust.

 

many people have made big power with 2" from turbo to IC and 2.25" to TB. It seems to work up to about 375-400 whp. I would do it just so there aren't any more abrupt transitions than there needs to be. less internal volume means less boost delay, good for the street. if it is all drag I'de go bigger to ensure good top end. I messed around with it on my setup and It isn't a huge change but more internal volume can be felt as a little delay.