Thanks Joel J, for clearing that up I am shore the new sirio engines will be extreamly good i know fom the s21wcr and s21pr pro evo2 sti that the extra 0.3mm stroke made the pr pro very strong down low and in my running of it i don't think it ever stoped pulling I can not wait for them. Can you make a post when they are relised to distrubters. Best Regards Jeremy.