Spark plugs + larger heat exchanger are a must, you can use the GTR one's or HKS make an equivalent also if you can't source GTR plugs, I know in Aus, HKS plugs were going to be much cheaper than GTR plugs and that was cost price on GTR plugs at the time (6 months ago).
you don't actually need anything on the list of items you have listed except maybe the Auto trans cooler, I'm running the stillen kit on a manual.
The only reason to upgrade fuel pump/injectors would be to run E85, even though you'd probably want 1000cc injectors over the 850's.
We already have an oil cooler on our cars stock in Aus, so adding an extra will still benefit but again not required. I see you have the 09 model from your profile, maybe double check this as I've got an 11 model, not sure if it was added to later models or came right from the 09's
So basically up to you but I wouldn't waste money on;
Fuel Pump/Injectors/MAF's (unless running E85).
|