I have a stuck bolt on my bloody catalytic converter... it's one of the three on the back of it, where it mates up to the exhaust. I tried soaking in WD40 overnight, which didn't work, and then I tried the heat and candle trick (which broke one of the others, but this one won't budge.) I can't fit my impact wrench on it (no room), and I'm at a loss for what to do... Any suggestions?