The issue is not HP it's how lean the bike is from stock, if you then put a big bore exhaust minus the cat then it runs far far too lean and that endangers the engine - the remap is designed to enable the bike to run a AT optimal fueling and thenone ive had down will adjust to air pressure and tempreture to keep it in the optimal range no matter what!
If you're in the U.K. Google hilltop motorcycles - Geoff is an expert in his field - does the Isle of man TT bikes amongest other things!
I've noticed much more torque low down and a crisper throttle at lower speeds which takes out the inherent jerkyness I was experiencing on the stock bike. - this more than likely a European issue due to our emission laws!
Main reason I changed mine was for the poor fuel I'm goi to see in Africa - the stock bike would have not been able to deal with it!