My 2004 FLHPI has a 95" kit, SE inake and the Supertrapp 2:1 exhaust with tunable discs. I bought it this way, and I'm trying to figure out why my bike sounds so cute. My discs stick out maybe an inch or two past the exhaust end. I assume the bike was tuned after all 3 performance mods were put on. I have read that you add discs to increase sounds and HP, and remove them to decrease both. Does anyone have experience with this exhaust? It is pretty darn quiet compared to all other bikes with performance exhaust. If I add discs, do I need to re-tune it?

 

There's some good disk tuning gouge at this link:

http://www.supertrapp.com/resource/faqs.asp