´Ello Bloke :) Hope this bit helps. I have an 05 Speedmaster and to compare to the 04´s I have not noticed much difference ..that is to say the 05 does have improved low end torque. However for me I beefed it up a bit with the factory offered "Slasher" exhaust short pipe run open with simply a re-jet of the carbs. In Arizona noise restrictions are non exsistant and the re-jet has solved any acceleration misnomers. I am wanting to lower me %!¤end for increased stability but for preformance the slashers are an inexpensive reliable upgrade. Also keep in mind the mods to the factory airbox. Check with a tech regarding specifics. HOPE THIS HELPS cause there will never be a sixth gear. Ha I ´ve grown up on trumpets..had two Harleys and BSA´s Minor mods will afford you the best of all worlds CHEERS! hd8836@hotmail.com