I have an '11 x5 50i with m package. I want to change the exhaust and get quad tips put on. I found a remus exhaust with square tips. Bimmian sells different tips that will fit the outlet exhaust diameter and are quads. My local garage is telling me it can't be done without cutting the bumper while Bimmian says it will fit into my bumper as is...can anyone confirm one way or the other who is right?

Anyone else done this? Seems unlikely that it can't be done without chopping up the bumper.