Quote Originally Posted by Lukus View Post
i have a 2002 gtp the 40th anniversary with a intake, zzp catback exhaust and 10.3mm zzp spark plug wires and 104 autolite spark plugs. I want to run a 3.4 pulley but i dont know if i could just let me know if i could or if i need more supporting mods.
intake- you have
catback- no performance gains what so ever
sparkplug wires- no performance gains, just a little tougher


you need headers if you plan on going further with your modding or you can run a plog and 3" downpipe and be stuck with the 3.4" pulley unless you intercool