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.
I did some research a bit myself a few days ago and learned alot about it too. It did mentioned about the cat,egr, timing and etc like u mention. As or my cat i bought it online but it did say obd1 and obd2 approved and i really dont want to go thru the trouble of having to get a new cat cus then ill have to get it reweld and etc an it cost me alot for all that with the cat ig ot rite now.

Again, thxs for all ur input! +1