EK4 vs EK9 Brake Booster/Master Cylinder

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boostjunkie

New Member
I was wondering if there is a difference in the EK4 (SIR) vs EK9 (Type R) brake booster and master cylinder. If there is a difference what is it? And is it worth swapping in a type r brake setup vs my ek4 sir one? Thanks.
 
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