I was hoping for COBB too, I went with Burger JB4. They have downpipe mods too, the JB4 has been trouble free in very hot and cold weather...and makes a real difference. There are 2 stages, I have stage 1.

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2012 535xi M-Sport, Carbon Black, Cinnamon-Alum Hex, Exec Pack, Tech Pack, HUD, Damper Control, BMW Apps, Heated Rear Seats