Great documentation! I recently got an 08 E92 M3 that came with the Akra slip-on. I've contemplated the Akra midpipe but the Akrapovic midpipe would have smog implications in CA. The Challenge Street X-Pipe was recommended since the primary cat stays in place. I see from you that requires welding. I was hoping to do the install myself... that might not be possible. How is the drone now that you have had it a while? Also, have you considered the ESS tune with the cold start mod for that drone?
Thoughts from anybody for that matter?
2008 AW E92 M3: Stage II and DCT tune by BPM Sport, convenience coding + coding for mDrive w/Euro MDM (no iDrive) & alarm retrofit by BPM Sport, Fox Red interior, MRF Velaforza full exhaust, carbon fiber M Performance spoiler, carbon fiber BMW badges, black grills, black OEM M3 ZCP 19" wheels, 15/12mm spacers and AW painted reflectors