I have an 08 GSR and my only mods are Invidia catback and UR testpipe. I am looking to upgrade my turbo down the line and I want to make sure I'm not forgetting anything.

-catback/hfc/dp
-ams cai
-ic/ic piping
-cams
-stock flange type turbo(red/green/dom)
-ams 600hp fuel system e85 ready, injectors(what size?), do i need fuel rail?, what about fuel regulator?
-tuning

Is this everything or am I forgetting stuff?

 

anyone?