I have a 99 Commodore VT Supercharged. Would i have to change anything if i want to fit 9psi kit? Jason August 03, 2023 07:02 Updated Assuming your car is in good working order and are willing to run on 98 octane fuel, then there would be nothing else required to install the 9-10psi kit. Comments 0 comments Please sign in to leave a comment.
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