Took delivery of my 2013 535i Msport Thursday night. Friday night I installed a custom quad tip Magnaflow catback that I bought off a user here. Also installed a 550i diffuser. Exhaust sounds pretty good. Slight drone around 2500, but I love the look of the quads over the dual tips. Debating if I am going to do a catless DP. Sounded good on my N55 335i E90 with an AA catback, but do not know if I want to deal with the noise on the F10.
