Originally Posted by m3an
your original post doesn't say that, did you replace the 2nd set of cats w/ staight pipes in the vid or is that mufflers only?
edit: nm see it now
Sorry for the confusion, if any. I had the secondary cats taken out awhile ago. Here is a picture for reference, to show you how it was done (pretty basic):
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.