I have looked around but haven't really seen anyone describe the process of unbolting the cats or the headers yet. I'm guessing its not too easy!

I have an exhaust leak from up around the passenger header and am lookin into replacing the gasket(s)

 

it's not hard just remove the air box and the intake pipe and everything should right there

 

so u can do it from the top side of the engine? it's an sc400 btw