I think I may have blown the gasket between the pre-cat and the upper part of the engine (not sure what its called) and there might be a leak as a result. How hard is it to replace the gasket, i.e. getting all 5 bolts off and taking out the front precat to place a new gasket there? anyone do this b4? thanks in advance

 

seal the beast up with some liquid gasket stuff its like 7 bucks does wonders...if your a chepo like me