Im almost done putting back my GReddy kit on. I want to upgrade the Downpipe and also get a new exhuast set up. I sold my old SP because it was too small of piping. Well anyways. What size do you guys suggest? Should I go all 2.5 from the Down pipe on? or 3''? or even 3'' to 2.5'' or vise versa? By the way it is going to be running at stock boost 7.8 psi and maybe sometimes at 10 psi on the track.

Thanks in Advance.

PS. If anyone needs help installing the GReddy kit shoot me an email, I've installed and un-installed about 3 of them.

 

always remember with turbo cars bigger is better

 

not extactly. that was the most unlogical answer. too big can be bad

 

TOO big = less velocity = turbo kickin in slower

2.5-3 Inch should be good. Nothing bigger.

 

How about this setup for a D16Y8 w/ a TD04H-15G @ 8psi:

2.5" downpipe
2.5" test pipe
3" catback

Sound good?