I will chime in here, although I have been reluctant to, knowing that DD was using Paul's header I worked out a much different exhaust cam and cam setting, to help cope with the smaller header/secondary pipe. Normally this combination of pistons /cams will do 200hp with one of many larger exhausts, I have been selling these parts for over ten years. NO OTHER CHANGES to the stock engine, apart from a heavy duty clutch. These parts are made to work as described. So I would say the different exhaust cam has helped a lot. 165 torques is not too much, I have low skill, and have ridden Rockets with over 220 Torques, one just has to think before pulling the trigger. If you manage to do an accidental wheelstand at 210 km/h,on a rocket which happened to me once, you will have a learning experience which stays with you. They are a big bike for a skinny guy like me to wrestle.