Hello there. I've got an c140 s500 n/a V8 and am thinking of installing electric cut outs. (2 inch in diameter) but the question is, where to install them and wont it harm the engine? I mean like combustion or something. I was actually thinking of welding them just before the last muffler but heard that it may be best if I install them just after the catalyzers. What do you think?