I have a 77 'doba 400 that is completely stock with lean burn, single exhaust with catalytic converter. I want to go ahead and cut off the cat, and put a dual flowmaster exhaust on it. I want to make sure that this will not cause any problems with the lean burn system. I got the damn thing running pretty decent and want to keep it that way for a while. I'm worried that removing the catalytic converter or changing the exhaust will trip some kind of sensor. I don't think the lean burn system was anywhere near that sophisticated...but I want to make sure before I do anything. I don't have to worry about emissions where I'm located. 25+ yr old cars are exempt.