cutouts worked great and are going back on our car at least. the car needs 3-4 passes to peak the power with them tho, once opened at the track after makign a few passes with them closed the next 3-4 runs get progressively quicker. if anyone can get a video off their verizon cellphone and get it playable on the net let me know and ill text message the video over to you that we made yesterday with the new exhaust.