Well, I finally got mine (put in 2 inch piping & removed the resonator). Just like I thought, my muffler didn't sound as loud because of the lack of sufficient air-flow. Now its sounds powerful, but I didn't really notice that much gain in performance, compared to when I put on the CAI. I'm happy now though, I don't have to rev that high to scare people who are going to cross the street, now they run when they here my engine rev . And the best part was, it only cost me $70... gotta love the junk yard by Shea Stadium (where the NY Mets play).