I just recently got my M4 exhaust from hammy the can pimp and it kicks :moon . Not only does it look dead sexy but it sounds great too. When my gf saw it she immediately :boob and wanted to go for a :hump . The pipe is very well made and everything bolted together with no problems (installed in about 30 mins). The only issue i have with it is that the passenger peg is really close to/touching the midpipe but that will only be on when my gf wants to go out on the bike with me. If you are looking for a pipe that has a deep growl and a 70's muscle car sounding idle, this is it. 9.8 out of 10!