It has been a few years, but when I was involved in a 73 RS type race car build, I sourced a 944 aluminum stepped master cylinder instead of using the normal go to 23mm. Pedal effort was less than the 930 as I remember. Worked great with the caliper combination ..had 930 fronts, rears were a smaller Porsche aluminum caliper, I don't recall which one. It took some work for mounting it and clearing the 15" wheels.
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