So excellent - well done and welcome to the world of mopeds (its NOT an addiction - lol)
Not trying to scare you off, just passing along some cautious advice.
Do a lot of research before doing any mods. Everything in interactive on the motor, so derestricting the intake would lead to rejetting the carb, even derestricting the exhause would lead to consideration of the restriction in the intake, that would lead to the carb jetting (that sort of thing). Some half researched mods could just give you worst performance, other could give you a seized engine.
Once you get into it you will enjoy tinkering and getting a few more mph or perhaps be inspired to kit and really go wild :)