the dyno port pipe that i sold to dynamac 1999 was down 5 hp at 7000 rpm over the pc 2 pipe ,,i have not tested any other dyno port pipes ,,,it looked to be around 3 inchs shorter in its primary tube ,,the dyno port pipedid not exceed the pc 2 any where else in the power band ,,, bob but theres no reason for your words like useless info,,, i dont type very well and i have been very busy,,and if you would have ask would have in time been able to reply