I have a greddy kit on my d16y7 and 2.5 inch piping all around which i believe is causing me some huge amount of lag. can i swap out the aluminized piping for PVC after the intercooler to a smaller diameter like 2 in. I have been running with PVc corners before and after the intercooler because of space for about 2 months now and never had any problems.

what do you guys think?

 

no reason why it would not work just look bad i guess. But i would switch from 2" before the intercooler and 2 1/4" after.