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AFAIK there is difference between S5 NA and S5 TII brake booster in USDM cars...i never had problems with my S4 brake booster, but after upgrading front calipers to brembo 4 piston calipers, my pedal feel went bad....upgrading to S5 TII brake booster and bolt-on 929 MC fixed it....bigger brakes sometimes comes with bigger pistons and upgrading MC is good idea to get back desired brake pedal feel...
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