You must use the force!
But seriously, it is a pain in the arse. I had to take mine off last weekend and I'll be taking it off again when I get the new downpipe this week. That one bolt at the bottom the only thing you can get is an open ended wrench on it. I'd put some liquid wrench or PBBlaster on it and let it sit for a while maybe then if you break it loose you can turn it off with your fingers.