If it comes down to it, I will. So far, I'm not putting the top down, but I'm sure bmw structural/mechanical engineers knew what they were doing when they put that in. It's not like they'd spend more money and add more weight for something that is not necessary.
I keep the top up and drive gently until I get this problem resolved. It seems like a lot of people want to jump on the exhaust trade, so either I'll order those parts for the brace or the person who wants my exhaust will order the parts. Thanks to everyone who brought this to my attention. I never would have known otherwise!