I got an 06 carburetored fxst and got the kerker 2:1 supermeg. When I bought it, it had 20 disks in it. I have a k&n air filter set up on the bike with the twin 88. Want to install but not sure how many discs to leave in it. Mostly want to install it and not have to worry about rejetting it any time soon. But would like to have some more grunt in the mid rpm range. It also has the open end installed. One more thing I don't have the bracket or the hardware to install it. Is there a part number to the kit I need? Thanks for any help or advise u offer.