im looking at another gtp with these mods
Threehorsepower mods in total... (1) K&N air filter (2) high flow catalitic (3) 3.4inch supercharger pulley.

K&N Drop In Replacement Air Filter 33-2141-1 - GPUNDER - PFYC.com

Pulley Boys Supercharger Pulley - GPUNDER - PFYC.com

High Flow Catalytic Converter - 3.8L V6 Engines - GPEXH - PFYC.com

are these enough supporting mods?