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That's a big can of worms.
to make the boost, you need the right turbo and the correct exhaust for it (you may or may not need a different one than you already have).
to handle the boost, you need new internals.
for fuel,you will need a fuel pump, regulator, injectors, and a new and extended fuel map to cover the new injectors, fuel psi, and characteristics of the new turbo if you got one.
to handle the air flow you will need a new maf, and the correct ecu programming for that.
for valvetrain, you will need heavier springs to reduce float, and you may want to get cam gears to reduce overlap
possibly a new oil pump and water pump, and I have heard of ppl incorporating oil piston squirters too.
Regardless of how much power you are pushing i recommend getting some rocker stoppers if you have a hydro valvetrain
That's about all I know. talk to someone who has turboed an SR20 for the details and any extra stuff you have to do on our cars.
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