I can't tell you the amount of compliments I get on the way my car sounds. I was one of the first to get the Megan on my car. The Megan has been on my car now for over 2 years with absolutely no issues. My car has Turner Test Pipes and a Megan catback and the sound is wonderful. It does drone a tad in the 2200rpm range, but then most aftermarket exhausts do. Its not bad though, just there a little.
Its not as loud as some of the other exhausts out there but it is also not the quietest. As a previous post stated, its in the middle. If you do the test pipes I think you will find yourself quite pleased.
As far as the exhaust not being louder than the OEM exhaust...well that poster may want to get a hearing test.
Its the best $525 I ever spent for my car.
2013 M3 Coupe-MR/BLK ZCP, identical to my 2011.
2011 M3 Coupe-MR/Blk
2007 Porsche 997C2S Speed Yellow/Blk sport seats
2004 BMW M3 Imola/Blk