Not worth it IMO ,been there and done it ,had my 172 cup cammed by btm ,did feel a lot quicker at first , this was party due to the last owner cocking up the timing belt and it only running at 150 bhp,once cammed it ran at 175 bhp and 168 torque,But have since been in a friends 182 which ran 178 bhp with just normal breathing mods which felt just as quick.Looking at buying a 182 at the moment and will not be camming it ,think mine cost about 1500 all in this was Cambelt change ,cams and mapping by rs tuning here in Leeds.Hope this helps .