Just bought a 1993 FXR that although a stock 80" is putting out 98 HP at the rear wheel. It has a Supertrapp 2-into-1 with 21 discs (a lot right?) and a 1.5" hole in the end cap. I'd like to quiet her down a little. Somebody told me that the open cap is like adding ten discs? Anyway, is the exhaust being this open almost equivalent to a drag pipe? With a closed cap, what would be a good baseline number of discs to go down to?