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Are the power gains, like horsepower or torque, going to be different between say an 87 street tune and a 91 or 93 race tune? I know that the race tune is far more agressive and responsive but does it really create more power between the different tunes?
 
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Yes.
With higher octanes you can run more spark advance.
Depending on what mods you have you can gain 5-15hp with a 91 over a 87 tune in a 3.8L
 
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