I run Dynomax bullets about 12" long with turnouts on the Challenger, when they were turned out I was asked to leave, went back to the trailer and swapped them side to side so they point at each other and that seemed to do the trick albeit I am right at 115 and have to do 5,000 rpm burnouts and hope another loud car is not alongside. I had put them on the Challenger a month or two back anticipating hitting one of the last Wednesday so left them on for Sunday. Thinking I am going to get a set of 3.5" Flowmaster Delta Force 40's and put them on the road runner in the same fashion, that or put it back on the street.