Originally Posted by KingJoseph

(1) Does the Nismo have the same cats as the base 370Z (i.e. can I expect the same gains that FI quotes on their website for HFCs or test pipes)?

(2) FI offers 300 cell and 100 cell HFCs for the 370Z. Is there any disadvantage to using the 100 cell cats on a naturally aspirated Nismo? It specifies that they were designed for turbo/supercharged vehicles, but they are lighter and (presumably) less restrictive.

(3) The test pipes appear to be heavier than the HFCs. Is this right? The test pipes are the pipes minus the extra hardware as I understand it.

(4) Can anybody comment on the FI exhaust volume without resonators vs 12" vs 18" vs stock Nismo? Any of the above would be much appreciated.

Thanks in advance... decisions, decisions!