They're ok although I wish they would have came with flanges to bolt down onto the bracket to be held in place. I can hear them make a buzz noise which is somewhat annoying I'll just have to take that to a welder and get it done. Had also ordered a y-pipe from them do not recommend fitment was not good (returned).Test pipe fitment was good self diy installation was easy enough to do alone. If I could I'd go back and order another brand of test pipes. Going to mix the agency/1320testpipes/stillen wipe see how that sounds. They also came with an anti reversion chamber whatever the hell that means.