Originally Posted by Simon1

The aftermarket cats or the "hi flow" cats are the type I always see have problems with not passing emissions, melting or clogging. I have seen it in the OEM cats also, but rarely.

ZI have ran 550 rwhp for 3-4 years, most of it with cats (OEM) and have never had a problem. I actually prefer the cats to be in the car because it is much quieter and it doesn't stink. But since I race and use a two step at the line, I need to be catless so I don't foul up my cats. Unless I found some used cats or a new take off H pipe, I would have to spend around $550 to get them replaced. Its cheaper and easier for me to spend $200 on an off road pipe and put it in for inspection and take it out when race season begins.

Originally Posted by hollywub

I turned off the rear O2 Sensors and I am not throwing a code otherwise. If I get past the issue of the physical inspection, do you think there would be an issue? The inspections here just read through the ODBII port, so I am guessing they are looking for problem codes...