Quote Originally Posted by cwhiteboy
Ok, did some research for you. High NOx has to do with exhaust temperature, and yours is too high. If you have a high flow cat, that definately isn't helping you. Try replacing your egr valve, costs like 2 dollars and takes 5 seconds. Your engine is probably running lean, so try to figure out why, or retard your ignition timing a little, it may be advanced too much.

Hope this helps. Let us know.
also, if you can get your hands on an OEM cat for a decent price, snatch that shit up.

made my dad's b16 pass after we replaced EVERYTHING els