Originally Posted by samsquanch
Is there much point in changing the throttle body without a tuner available?
The fastman TB similar to a CAI will give you better throttle response, something you can feel. How much HP I don't know, you could try a jet chip until an actual tuner comes out. Even w/ all my mods the stage one still made a small difference in the higher rpms. I can't speak for the stage 2, w/o a tune the headers aren't worth it IMO, aftermarket muffler and y-pipe will give you something and be cheaper. The underdrive pulley was also something I could easily feel a difference in the truck after install.