Ive got a buddy who just picked up a 2002 GTX 4tec. He wants to squeeze a little more speed out of it.(He thinks he will be able to hang with my Ultra haha) I already know you can easily make a SC pick up but What are you guys doing to the NA 4 Tecs to help them out a bit?

I told him we wont be able to do much without tearing into the engine, but what are some bolt on mods to gain a MPH or 2 here and there?

Im already looking into a Impeller, SS Wear ring and Intake grate.

What else can be done to these though? Any tips would be great!