My 275's don't smoke at all with the box off either at idle or during a hard accel. I find I like driving it this way most of the time now, power comes on alot smoother and is more drivable in traffic. I don't make too many people mad that way.

On 5x5 it is a different animal. I beat a Mustang 5.0 untill he hit his Nitrous, then he was gone. Nobody was witness since they couldn't see from all of the smoke.