I need someone who knows anything about the GXPs. I have an 05'. There is an intake for the 06'. They claim it won't work with my car, yet the dealer says that the part numbers and setup are exactly the same from 05-07. Any ideas, Grand Prix family or who might know?
Just put a K&N Aircharger (#67-3059 I think) on my 05 GXP and with the resonator deleted it can really set you back in the seat on WOT. Throttle response seems alot quicker and I've noticed about 1.5 mpg improvement. The instructions were very clear and every little detail was exactly as described, so I think you can get one for your 05 without worry!
Sorry so long, guys. i put the 06' K&N CAI on my 05'. Fit perfect. Haven't went back to the dyno since my 3" downpipe, CAI, and Maganaflow install. Sound mean when you hit the gas.