Originally Posted by Maxwell
Yeah I believe your right, it's allowing the turbos to spin a little faster. I bet we would probably see a gain of 8-10 hp realistically.
I'd guess even less. You can take the cats off on an LS1 Fbody and pick up just 8-10 hp, or take them off a Viper GTS and pick up about 12-15 horsepower. Since the Crossfire is making much less horsepower than either of those, I'd wager 5-6 horsepower. A change in the outside temperature or humidity can produce similar kinds of changes on a dyno.
I'm no hardcore tree hugger, but removing cats just doesn't make sense to me. The extremely little upside isn't worth the impact. I've built a number of blown and nitrous cars, and managed to make them all run just fine with cats installed. I have kids you know :-)
Mike