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An acquaintance of mine has asked me if id be willing to install a downpipe and AWE catback on his 2021 BMW M340i x drive.

I don't own a bmw and never have, im a mustang guy and have done exhaust on my 1995 mustang gt and 2019 mustang gt, Including putting longtubes on the 19, which was a pain (had to remove motor mounts and lift the engine/trans).

I am fairly mechanically Inclined but certainly no pro. I did build the engine in my 1995 mustang with the help of my father back in undergrad (entire engine build, built a stroker motor with heads/cam). My automotive skill level is certainly well beyond the average person, but I have never had any official training. Just wrenching on my cars and my family's cars for the last 25 years. I have access to all the tools I would need.

Ive looked Into the exhaust on the 340i and it truly does not look very difficult from what ive seen, and looks like maybe an afternoon job. Am I correct in that assessment? I dont have a lift but I do have ramps/jacks to crawl around under.

What might a local shop charge for such an install? He offered to pay me and I am not sure what would be fair.

Thank you guys for any insight. While I am a ford guy, I certainly love all performance cars, and the B58 seems to be a truly fantastic engine the more i read and learn about it. Thanks!