mk5 and mk6 RS2000's didnt come with a turbo so no worries there lol...
i have a mk6RS and this is the one id choose purely becasue its younger and has the comfort to go along with the grin of driving it..
its not hard to find modified parts at all..its just very expensive tuning because its a N/A motor,not a turbo..and not a widely purchased car either..
ive got a set of kent cams in mine along with a fully flowed head and unichip which gives 170bhp..
the mk5 looked a bit meaner and that bonnet looks the nutz...but the older they are,like most cars..the worse they are to keep..get a P plate RS with loads history and you'l be halfway their..

there solid reliable motors and quick enuff to have fun in..their massivley underated and sneered upon,which makes me love them that bit more lol..cant beat passing some smartaRSe who has written you off before you pullaway