welcome to the forum yeah the prolines fit on the rush rims but try thr hpi geolanders or the dogg bones , the proline dirt works or the gladiator 2 would be a better choice for as its a more all round set up
for speed change the gearin and get a new pipe and airfilter
gearing cost about £10-£12 for a spur and clutch bell combo(both)
a good pipe is the mielke one made for the rush for £28 :the stock i balls and this works well with the stock header as the stock header is of good quality
hpi make a good airfilter for £12:the stock is s**t
and edit make bearing kits for the rush for £10 but im not to sure not much increase in speed but a little
thats basics i think just depend what you willing to spend most of that can be found on mirage uk site sorry i didnt have the time to serch for everything but i got the pipe and the airfilter the gearing and bearings are on there youll just have to look


heres the pipe it looks like a shopping list but you just print it off a take it to your lhs-[link=http://www.mirageracing.com/shoplist.php?func=add&id=MK1605P]mirage shopping list[/link]
heres the airfilter description-http://www.hpieurope.com/piw.php?lang=en&partNo=87207
here the mirage link-[link=http://www.mirageracing.com/shoplist.php?func=remove&id=MK1605P] airfilter mirage[/link]

hope that helps matey