s2kone.

So I have a bone stock 01 ap1 and just installed a 70mm invidia test pipe and now everytime I shift and get back on the gas it feels like it hesitates, what could be the problem? Im running rich as shit too. Could it be that the test pipe is too big, and I should have gotten the 60mm?

Any imput would be great!

Thanks.

JDMQuip

Did you reset the ECU?

ian02s2k

How do you know its running rich? It should actually lean out with a test pipe. Do you have an o2 sim. installed? And yes, you should have gone with the 60mm unless you plan on upgrading from the factory exhaust.

s2k dre

01 ecu's run rich too. The pipe will lean it out too.

ap1_tot

I don't think the pipe diameter has got anything to do wit it. Check for leaks i guess.

Gernby

It was a mistake to put a 70 mm on with a stock exhaust. If you aren't planning to get a 70 mm exhuast, then get a 60 mm TP.