i picked up my car today had it detailed clay bar and waxed. the test pipes make the exhaust sound so much better. i do have the buzzing noise issue around 4000 rpm and when im deaccelerating theres a pshhh noise, sounds like a air break. the buzzing sound does seem ricey but its diffrent from what im used to so i like it. as far as power gain, i do not feel anything, maybe even a little slower. I had my mom, lol, drive it so i could hear it and it sounds awesome, she said it felt alot faster then the last time she drove it. ive added the test pipes and crank pulley since then. i guess now im gonna reset the ecu.