1Fast,
20054 is the Triumph "party line" tune for non-stock mufflers. If you want to go with stock Triumph tunes, I would go with 20055. It is the least restrictive in terms of power limiters and is considered by many in this forum, including myself, as the "best" Triumph tune. In terms of the underseat K&N, someone posted dyno runs on this sometime ago... K&N added 3RWHP and removal of the underseat air scoop added 1RWHP. The 20050_1,_2,_3 are the Tuneboy tunes developed by Wayne on a dyno in Oz.... He does not have a tune for Jardines with underseat stock/K&N filters. I would start with 20050_2 and go to a dyno shop that understands Tuneboy and develop one for the Jardines. I am seriously considering Jardines while keeping the intake as underseat K&Ns. So I might be doing this myself sometime in the near future....
Mike....