Has anyone tested underdrives, TB, upper, o/r pipe (before and after ET) on non pi motor. I'm starting a new project so learning from others helps me save money and time. please give name brands on parts because all parts are different. thanks My car is a 97 S281 convertible 4.6L (N/A) with an automatic. All Saleen did was installed after-cat exhaust and a K&N on this vehicle. Base Run r/t .011 60' 2.221 330' 6.320 1/8 9.693 MPH 70.689 I'm ready for my first mod but I don't want to waste money. HP means nothing to me only pt A to pt B.