something thats not too monster n reliable, one of my friend told me that the turbo use in official rally subaru hv the same size n boost with my standard sti, but it has ball bearing n it spool better, is it true?, do l need to change my con-rod n piston if l used that turbo?,where can l buy n how much is it?? thank you.

l believe that is true, the official rally sti is basically the same as stock. generally just a gutted version with a lot of sponsor stickers haha. but to answer your question, you can find lots of turbo uprades at http://turbo-kits.com/ reliable ones, high performance ones, middle, whatever.

good luck on your turbo search

a ball bearing is the way to go, they are pricey though. expect to pay around $2500-$4000 no need to change the pistons but you will need your ecu tuned to match up with the turbo kit. you can go to sportcompactonly.com to check out some turbo kits. good luck.

The SWRT cars have a much more complicated system that is completely different than your VF37. What power levels are you looking for? Have you done other mods already? Have you talked to any tuners? A good turbo back exhaust, intake and tuning will give you a good 50+ hp. Is that not enough? l am not really familiar with upgrades to the twin scroll system but HKS has an upgrade.

how much power do you want?
GT30 and GT35 are very nice. good spooling range