View Full Version : Tuning HD 06 Ultra

06-11-2009, 01:03 PM
I have a 2006 Harley Ultra Classic which is completely stock except for a K&N filter designed for the stock air filter backing plate, and a set of the 4" slip on external disc megaphone mufflers. How many discs would you suggest I use in the right and the left mufflers ?

06-11-2009, 02:52 PM
I would start with 6 and 4 with the stock Fi. then you can add if you want a little bit more, max of 8 (rt side).
Be sure to use liberal amounts of anti-seize on the screw threads and don't over tighten.

06-11-2009, 03:40 PM
Thank you jwells. I appreciate your suggestion. Regards.

06-12-2009, 07:42 AM
Thank you, have fun with it.

06-12-2009, 12:39 PM
The bike set up with the 6 discs on the right and 4 on the left runs very well with a seat of the pants increase in torque and a nice exhaust note. Thank you.
I'm going to take the bike to the dealer for a stage 1 upgrade to the computer. Still using the small K&N filter installed on the stock backing plate, how many discs would you suggest for each side please ?

06-12-2009, 05:24 PM
You can add 1 or 2 to each side, should be a good runner.

06-23-2009, 02:55 PM
Thank you once again for your suggestions. I'm currently running 8 and 6 discs with the stage 1 download and I'm pleased with the increase in performance. I have a Ness Big Sucker stage 1 air cleaner and backing plate coming in the mail. Would you suggest adding more discs ?
Thanks very much, John