Originally Posted by
CappyKD
I just put a direct fit Magnaflow ODBII High flow cat on my 97 GSR and it fit perfect, cost $160 and made my car go from a Gross Polluter to Passed! Well worth it!
Glad you passed! This topic seems to come down to just the luck of the draw as far as passing visual. As Dave mentions above, there are zero CARB-legal aftermarket cats.
The good news, at least for many of us, is that the OEM cat is not a restriction at or near stock power level. Dave also mentions this, and I've re-confirmed from another source that the factory unit actually flows quite well and should last a very long time. I think the only problem is when you need a 2 1/2" or 3" exhaust for more serious power mods.