Hellow & Welcome
Call or Email Dynojet you will get a straight answer.
With all stock difference will be to little if even noticeable for $$$ spent.
Basically they add more fuel. ( Honda OEM tune is on the Lean side )
To burn added fuel efficiently: ( Need More Air In ) & (Open Up the Exhaust to get added exhaust OUT ) just for starters.
The gain will be: little better mid range pull.( added benifit will run a little cooler )
Under certain conditions pushing the revlimiter you can gain 2- 3 mph. ( 1000 LBS. 475 cc. Machine is never ging to be overly Fast )
Someone on this forum has done it. (Do a search.)
You now have a new drain Valve on your bank account.