what mods are available for cheap just to get that little more out of my 125 its doing about 60-65 now
There is no such thing as a cheap mod. Tuning costs money. Well actually apart from fitting a big screen on the front and losing some weight...
Even if you start with a 2nd hand exhaust, u will need to factor in jetting and maybe rollers and clutch springs. Don't think u'll get that much more of a top speed but u'd shed sum weight. Unsure as to a top speed i imagine just under 60 genuine not what is on the clocks.