if you're doing only axle back now, with the intention of going full...go akra.
My akra rear with challenge sport pipe (HFC's) sounds sick... it's not obnoxious, but it's a deep aggressive tone with almost no drone in the cabin at all.
2012 MR e92 M3 DCT, fully loaded... ESS VT2-625
, Brembo 380, BBS FI's, Akra/Challenge Sport, KW Sleeve kit, Full OEM CF Interior
2008 e92 M3 Coupe 6MT | AW/BLK Extended...SOLD!