changing ur wheels and rims will show u faulty speedo readings of say another +-5-10km/h.
the speedo mite show u 180 but the techi will hardly be at 3k or 4k meaning u can still go up but the car wnt go.. thats the limiter in action.
as for the ad..... u can see a stock civic doing 0-100 in 4 secs here on pw ads... dnt fall for that:p
so a markX can go 200+ but u cnt cuz of the limiter.