NEED HELP WITH tuning 08 NRG, IM CLUELESS

HI, i just turned 16 and just bought a 2008 nrg for £550 on ebay and im pretty sure its still resrticted, i have read through the forum but i still dont have a solid idea... i want to tune the moped so it hits around 60mph...im aware i could possibly do this by upgrading to a 70cc bore kit and a sports pipe. can i do anything else? when change the pipe and bore kit do i need to change the 'rollers' or 'upjet' it or anything like that? whats the best order to tune the ped, pipe first then bore kit....blah blah blah. also if i change the pipe would there still be any restrictions on the bike or in the sports pipe? if i do this tuning will the moped still pass its mot as a 50cc? i will be working on it myself although a family friend is a mechanic but i would like to do this independently and learn my way around the bike so take it easy on me lol . any helpful replys will be much appriciated, thanks