Ok, I know there is a great sticky about modifications to do to the GTP but it doesn't say how much of a HP gain one can expect. I have about $180 to drop on one mod and I wanted to see what the opinions are out there.
PLOG -$150
Wizaired -$150
Ported m90 - $100
Down Pipe - haven't found a good price yet and I want a CAT, hated the smell of the
gutted cat on the Camaro and I am not going there again
I just emailed the guy with the m90 to ask about who did the porting and if it is just the case. I have also heard bad things about fuel economy dropping with the installation of a FWI and/or CAI and I would like to keep my fuel economy the same. At this point I am leaning towards the PLOG but I wanted to hear from those who have experience with these modifications.
