hey, i just installed the zzp hv3 in my GP, I now currently have the zzp hv3, K&N CAI, and magnaflow mufflers. My car is a 1998 GP GT with 149***kms. Before the hv3 i should of had a little boost of hp, but it seemed that i got none, and i installed the hv3 and the performance got worse.(it is installed correctly.) Before my hv3, i was getting 0-60's in low 9's, or 9 flat. Now i tried it with the hv3, it is now 10.2. That is just wrong isnt it. What is wrong with my car? Does my PCM need to get tuned? i am thinking on getting an Overkill Pcm, do you guys think it would help? Or is it just wear and tear over the years thats making my car so slow? Thanks for the help guys, i am really getting frusterated over this, and all your imput would be apretiated.