Emissions Test REJECTED

[DoubleAIm]

Thanks for all the tips everyone, so far I have been driving around for a week and starting the X when ever I can when the car is complete cold and put some miles on her. I just realize I have the "I/M readiness" function on my creader vi and it said everything is OK or INC on two/three things(which is good??) and went back for the test. They plug in the OBD and it was rejected again so this time they said they will do it the old school way and put it on the dyno and measure the exhaust gases. Which came back FAIL(results of test link below, did know how to upload images) and pass 2 out of 3 items. The NOx was too high so now I don't really know what to do except to bring it into a shop. Did a little research about high NOx and it's mostly due to engine running lean/hot or bad cat/not up to temp. I'll try putting in octane fuel additives and change out the spark plugs and air filter and driving her hard on the highway before proceeding to test her again. Anyone have any other idea or parts I should look over before testing her again? Thanks in advance!

https://drive.google.com/file/d/0Bx8...it?usp=sharing