Originally Posted by michaeldch
So I ran into a problem last weekend. The nuts which connect the downpipes to the midpipe were amazingly rusted. It was so bad that despite soaking for hours in PB blaster both lower nuts stripped when I tried to remove them. I ended up having to cut the nuts with half the stud off. Next step is to get the remains of the stud out of the downpipe flange... And that seems to require downpipe removal. I found a nice looking DIY for that (specifically for the xi). Never a dull moment :/
I had that exact thing happen when I went to remove my aftermarket exhaust from my mustang when I traded it in for my 335xi. Super frustrating.