I'll agree a 3" pipe is excessive for an NA. 2.5" is about right particularly after modding some of the flow like headers etc.. There are many NA's running around out there, wit Hipers..the UR pulley will somewhat compensate for the loss of backpressure...but once again its all relative. I still think his best bet is to make one or buy a used setup.
------------------------------------------------------------ ------------------------------------------------------------ 1994 300ZX Coupe -- Stage 5 1992 240SX SE -- Stock 1991 Nissan PU -- BPU ------------------------------------------------------------ Robert Maddrey AIM: NA300ZXusa Email: Rob@ecza.org My Website ------------------------------------------------------------