Had the POWERCHIPGOLD 91 upgrade to my CROSSFIRE, and so far I am quite pleased with the results. Definitely noticed the increase in horsepower ( 15-17HP increase ) when I need to move around traffic on the freeways, but, more importantly, the car has increased miles to the gallon. Before I had the modification, I was averaging around 26-28 miles per gallon ( 28 miles per gallon only twice ) on 85% freeway/15% street driving. I got the upgrade last week and on the same ratio of driving, I got 29 1/2 miles to the gallon. Mind you, I jumped on the car a lot more than usual, so I burned more gas than usual, just to feel the acceleration and exhiliration. This week I will take it slow ( 65mph ) and not "jump" on the accelerator. I will post mileage results next week. I am expecting 30 miles per gallon!! Oh yeah and by the way, my XFIRE is a 6-speed manual, graphite gray, sweet drivin' machine, that still turns heads. I am not into racing, but somewhere in this forum there's a guy who posted speed results on his upgrade. AS for me, give me mileage, or give me...