Done that Doc....i now have a cat box sitting in my garage and a boom box with freeflow pipes strapped onto the bike....While i didnt put my bike on the dyno...we put my cobbers 'R' on the dyno before and after doing the same fix on that. The tune didnt alter...and i suppose thats because we didnt alter the fueling or air intake.....just the exhaust....we saved probably 6 or 7 kilos in weight which alone creates a bit more horseys.
Looking forward to installing the ladies tune...just need a OBD link LX and itll happen.
p.s....just ordered one ...woop!