evolancer:
looks like we are on the same boat.....just converted to gsr..hehe....well, this is what i am gonna do...changing to hks ssqv bov(nicer sound and can take higher boost), changing air filter(current one is the air-box and using it u won't even get any bov sound bcoz of air limitations), turbo timer(must la...if not how to cool the oil?unless u wanna sit in ur car for about 1-2mins after u hv parked ur car??hehehe), adjustable suspensions(probably hotbits or hwl)u'll need good control of ur car and not just power, boost meter. for now that's it.:)
oneGSR:
there is no small budget for boosting up to 1.0 bar. u'll definitely need extractor change, turbo change, injectors change, fuel pump, i/c and etc..etc...but dun regret after doing it.:). best plug? i think they are the same for any engine but i think volker spark plugs are quite good...they are sold in speedworks. bigger turbine meaning u will need external wastegate(correct me if i am wrong all sifus who are reading) coz if u hv lots coming in, u'll need something to push them out. if not it will be too rich and there comes lag.
not only gsr cars are maintained like that but ALL turbo cars are mantained like that. for best maintainence, every 4000km change black oil. currently i am using motul. not too bad ler....and u must be very on time for ur servicing. coz turbo cars have powerfull boost. therefore, timing belt is an important issue here...keep checking if there is black oil lor....dun do crazy boosts if not it'll start leaking and that time u'll start to curse and regret. good pipping may help like probably stainless steel pipping.
well...i guess better stop here..hahahaha....damn tired and may end up "crapping" more....:p..chao dude and good luck