[Pray for Mojo]

I had zero issues at Calgary BMW running my car through there with Jb4 on map 2 and catless downpipes. Never had my warranty voided and I did it for 2 years straight. I didn't go in there advertising that I had modified my car, but the techs aren't going to rat you out for modifying your exhaust. There is zero chance BMW NA will void your powertrain warranty for aftermarket exhaust.