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Aftermarket springs are not necessary with the stock supercharger wheel.
Would the 12.9 bolts be fitted to a 2017 RXP300?
Stock valve valvetrain is good to 8650.
You need a 13/18 impeller for it. Thats pretty much standard when turning...
Check your tank vent, make sure its not sticking closed.
Aftermarket springs are not necessary with the stock supercharger wheel.
Valve springs and retainers