I had the SERT, but decided to go with the PCV instead. Had the SE Heavy Breather sitting around for awhile, as well as the Rinehart TD's. Going on Saturday morning, can't wait to see/feel/hear the difference! This Winter the Stage II will go in and that should make a much bigger difference, but for now this will work. Jamie got it to me in 3 days, pre-programmed after I ordered it on Monday. As everybody else always says, so far I'm very impressed with his speed/customer service.