I'm looking into buying some resonated test pipes for my G37s 2009. my 3 choices are, AAM resonated, Berk resonated, and the CNT resonated. I need some suggestions on which ones to go with, thanks.

 

Motordyne Art pipes are resonated in a roundabout way, looks like the CNT's are sort of a copy. Going by looks, they don't look to have been engineered properly. I'd get first hand experience with the CNT's before purchasing.

Fast Intentions also makes a set of resonated test pipes and they'd probably be my vote.

AAM's quality has come into question as of late on the 370z forum with some less than ideal welds and them not backing up their products. I'd look up those threads and make your own judgement.

 

I have to wonder why you're wanting to increase smog in your neighborhood? For a few hp?

 

Berk has better fitment than anything ive used including art pipes.