So right after buying my car which came with the Kenne Bell blower I went out and had a set of QTP cutouts installed. I a pair on my LSX Corvette and just LOVED the sound with a heads cam combo. I have put about 800 miles on the car over the past few months and EVERY time I open the cutouts the car feels slower. The boost doesn't seem to be accurate and honestly the sound while being loud is nothing like my Vette. Needless to say when I close the, and let Kenne Bell along with my Corsa cat back play a tune it sounds great and feels very smooth. After all my research I have come to the realization that my canned KB tune is not equipped to support cutouts and I am defeating the purpose. While they sound cool I think I will save them for the parking lot.