As mentioned in an earlier thread I have a non CARB legal supercharged car that I am trying to make California legal. I need to get both left and right cats. The factory cats are about $2000 for the pair. There seems to be quite a few aftermarket cats out there that are significantly cheaper. My car is supercharged, so I would assume that what's going out the engine is dirtier than a NA car. Passing smog and the sniffer test is my biggest concern. Should I break down and pay $2k for new OEM cats, or am I wasting money and just buy much less expensive after market? If so, which brand should I get? Thanks.