I have a 04' GTO and I have a K&N FIPK II cold air intake, custom exhaust- headers back, NGK plugs & 8.5mm MSD wires and a dyno tune. the car went from 287 RWHP to 342 RWHP & 296 RWTQ to 372 RWTQ and from a 13.87 1/4 mile to a 13.04 1/4 mile.

what else should I do besides tires because I already ordered BF Goodrich G-Force Drag Radials. I want to get into the low 12 sec. range.

I am also looking for a 06' GTO hood in fiberglass but know one has made them yet, any help on this to?

snipergoat

Have you done any suspension work yet? Rear springs, shocks and possibly a sway bar could help you get the power down more efficiently.

As for power mods I'd say cam or cam and heads would be next up. :)