Originally Posted by m3an
^^ possibly, but it's best to always start at the rear anyways; upgrade muffler than work your way up . Theres not point in blowing through a straw that still necks down at the end ya know?
There really is no restriction with the OEM muffler..you are lucky to see 2-3rwhp difference..in fact Akrapovic only claims 2-3rwhp for just the rear section, and that can be statistical noise from the dyno.
2013 M3 Coupe-MR/BLK ZCP, ACM test pipes, BPM Stg2 dev. tune and Megan catback, AFE Stg2. with C/F elbow
Previous rides: 2011 M3 Coupe-MR/Blk
2007 Porsche 997C2S Speed Yellow/Blk sport seats
2004 BMW M3 Imola/Blk