W1N, I have no clue about the emissions. Call LPE and speak to Tim. They are very helpful and stand behind their product even when others don't. When my truck didn't perform properly they picked it up, fixed it and shipped it back... No charge. All because I was about a second off where I should be. They have even sent me a programmer to have.
I have been very pleased with them and to pull the times I have with all that extra crap on the truck really says something.
Here is a link to the Motor Trend article. BTW, I was pulling more HP and Torque than this truck. They are all alittle different.
http://motortrend.com/features/perfo...0308_tuner_h2/