I added 4 Aero AR25 resonators to an x pipe that I had a muffler shop create for me. I have a custom magnaflow muffler set up and turner test pipes. Sounds pretty good, and when I am cruising, it is only slightly louder than when I had the stock cats.
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2008 (07/08) E92 M3 BPM Stage II Tuned by Mike Benvo, 6MT, Turner Test Pipes, Magnaflow Custom Catback Exhaust (Magnaflow X Pipe, secondary cat delete, Aero Resonators and Helmholtz Chambers),Vorsteiner CF Lip, Hamann Style CF rear diffuser, CF Rear Decklid Spoiler, BMW Performance Kidney Grills, CF Side Grills, OEM GTS Wheels, K&N Drop-In Filter, GP Thunder 8k Angel Eyes, Painted Reflectors.
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