I don't know how many HP you can add-depends on your exhaust, intake, and engine mods-but there is no difference between the touring and roadster engines or trannies. They have unrestricted the new roadster tunes by opening the secondaries, which are ridiculously closed down in the tourings. If you could get into the touring tune with TuneECU you could fix that easily. I know you can do that on the older touring models without screwing up the ECM but not sure if that applies to the new ones. The new Tourings come with ABS which is computer-controlled - I don't see how you can just add it.