Originally Posted by LiM3y
Sounds a lot different to the full cat-back system. The full cat back system is much deeper in tone. The full system has a pretty loud drone at cruising speed (2500 - 3500 in 6MT). I took mine off after a few months. I keep meaning to sell it!
That's exactly where I have the drone too. If I go into a lower gear and go above 4k RPMS, its gone and its all normal sound to me. Must be just the "nature" of these mufflers. Hmm.
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.