I just got a new bike, 2004 FLHTCUI with a 103" screamin eagle kit, bike dyno at 101 hp 105 tq. It has true duals, I want to put my Super Meg on it, from my 1989 FLHTC. The 89 got it old exhaust back on, super trapp slip on. I will be running a open end cap. How many discs should I use. Thank you for the reply