I took the bottle out a few years ago actually... I didn't want to hurt the motor and on the street it just equated to more tire smoke than anything else... I wouldn't really call my car a sleeper. It sounds a whole hell of a lot meaner than the time slips those guys hand me at the end of the track. Really, there is nothing all that special about my car mechanically - sbc, 4-speed, 9". I know a lot of guys with similar setups that run more than a second faster than I do... Hell, there was a guy at the "day of the drags" that was running low 11's in a nova wagon with a reasonably strong and streetable sbc...