has the V4R front forks and rear shocks with the same internals in them as the R, has the 520 sprocket set of the R, the same brakes, same everything except it has lighter wheels than the R...dunno about the engine internals, but I have a Streetfighter V4S with a Termi exhaust and upmap, and this bike spins up way faster abs pulls way harder than my SFV4S...was wheelie’ ing a bit with anti wheelie set at 3 on this bike and the SFV4S won’t wheelie unless I try to in setting 1
bike handles amazing from the little bit I got out of it on a 45 minute ride home