The belt can be done either way, you can bypass both if you want or just the smog pump if you want. Just need to know the length for which ever one you want to do. It is very easy to switch the belts.
AS for the cats, all the high flow systems with cats only have 2 cats. I would think if you wanted to keep it Legal then you should probably buy one of these systems rather than cutting up yours, plus that way you can always put the original H-pipe back on if you need to.
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