I didn't use it this year...and barely passed. I'll take a look at my previous results and see what it says. When I used it on '05, the results were better than new.
Driving the car like a madman to get the cats nice and hot has done more for me in the past than any over the counter additive I have tried.
Just find a place where they will let you keep the car revved up until the very moment they run the test. The last time I had my car smogged the guy let me rev it on the dyno and everything until the test begun.
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