It would create huge problems with brake balance that would probably be difficult to resolve. The piston area on the 4 piston Nissan caliper would be WAY too large to match the upgraded front system. BBK's often alter the piston size it the caliper to maintain proper brake balance for the entire system that's why your 6 piston front BBK still works well with your 2 piston Nissan rear system.
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2010 Brilliant Silver, Base w/Sport Package, AT7, Katzkin leather, upgraded audio and lots of Dynamat and a bunch of small stuff.
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