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Noob thats too vague a question. Jesus Christ. What are the specs on the turbo and the car and drivetrain. Even then you should make around 35 hp to the ground.
a .42/.48 is only good to around 230-250hp but tends to die out on the top end of the higher revving engines like the GSR or B16/B18C5 etc. A .60/.48 T3 or .60/.63 T3 would be a much better choice