Looking to add some aftermarket parts to give my TC a little more boost....considered the supercharger but dont want to spend 4k for 40 HP, just ordered a Throttle Body Spacer, dropped in a K & N, and am looking at an exhaust...initially looked at the TRD axleback.....did no want to void the warranty but foujd out the warranty should not be voided with a cat back from flowmaster? is this true? any more ideas would be great as well as ideas about the throttle body and availabe exhausts, thanks!