I am installing a Peakboost top mount turbo kit, t3 t60-1 turbo on a b20. My old setup has a 3.00 in downpipe and exhaust, new kit has a 2.5 in. Down pipe, shooul I replace the 2.5 dp with a 3 in, adapt the downpipe to the 3 in exhaust, or just go with 2.5 in from turbo back? I am looking for around 400 whp when I get my car tuned by Stoopid. Just need a little advice. Thank u

 

you shouldn't have a problem making 400hp with the 2.5" exhaust.. .but I'd definatlely go with a 3" DP... ideally you want it 3" all the way back.. it will be a more efficient setup like that.

Can you get 400hp out of it probobly but 2.5 DP will definately be choking up that turbo bad.

 

Just get a 3inch exhaust. K teller with magnaflow muffler or thermal exhaust is the way to go.

 

either run it as is or get a 3" downpipe from peakboost. definitely do not downgrade to 2.5" exhaust, that would be a waste of time/money. as stated above, best would be full 3" turbo back.

 

The peakboost kit i bought from someone else was making 383 hp on a 2.5". was really chocking the turbo though...i have a really nice exhaust on mine so i think im going to get the 3 in...allthe way to the muffler wich is 2.5" it will get the job done. i have such a nice exhaust that i dont wanna sell it..

def keep the 3 in DP.