I am running the ACS Race muffler which is essentially made by Remus, and I feel a good gain in the mid-high. The rpm does not feel as restricted as before. Definitely a gain IMHO. Only loss is that its a cop magnet.
2008 E92 ///M3 Alpine White M-DCT| Novillo-Black Interior| Carbon Fibre Roof| Premium Sound System| EDC| 19's Advan RS w/ Michelin PS2 Cups| iPod| GruppeM Air Intake| GruppeM Steel Braided Lines|Ferodo DS2500 Pads| Akrapovic Full Header-Back Titanium Exhaust| 6000K Philips D1S| 3M Tints|