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Originally Posted by E3GSR
a turbo off a I,II or a III will fit mate. 
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Now that's interesting my friend has also has a Proton Coupe which uses the GSR engine, He's now got the turbo fitted on.
Had it rolling roaded today - Very impressive considering it's still running 10.5:1 compression ratio and stock internals.
He operator had to back off near the top end as the car started to pink - he was running on 95 instead of 99!!
I'm sure he'll be after even more power as well.

Would the ecu need to be swapped from a GSR to evo one? Any other things he would need to do ? Maybe drop the compression down.