I've got a 2010 Street Glide with a 103 engine (originally a 96 but with a dealer installed 103 kit), SE air cleaner with K&N filter, and Nightstick slip-on. Recently I replaced the stock headers with a cat-free set and installed a Power Commander V. I'll be having it dyno tuned with individual cyclinder maps.

Can you recommend a good starting point for number of discs, closed or open, etc.?