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Model: 964, Year:1991, Mileage:110k, Type of use:Track use only
I recently upgraded my 91 2 piston rear brakes to a 4 piston OEM brakes. Some have suggested that I could gut my existing bias valve than to switch to an brake proportioning valve from the standard 45 bar unit to the later 55 bar unit. (part no 964 355 305 10). What do you recommend ? Thanks you.

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