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Boundary shim kit for 1989–2005 Ford/Mazda BP I4 applications includes multiple PSI options (7/14/21/28/35) and a retaining pin for installation. Provided as a set of shims to adjust fuel or boost-related calibration points, the kit is intended to fit the specified Ford and Mazda BP four-cylinder engines and aids in tuning by changing the referenced pressure settings using the supplied hardware.
Boundary 89-05 Ford/Mazda BP (All Types) I4 Shim Kit (7/14/21/28/35 PSI) w/Retaining Pin
