[coyled]

David, it will depend on the power of your motor and the exhaust itself. My guess would be that with 350hp and a good exhaust system that you will not gain much hp. Try it and see if it feels faster or your lap times improve. Or, go to the drag strip and make 2 passes, 1 corked up and the other open. If the MPH picks up, you are making more power. Scott