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Replaces the stock secondary (rear)regulator. With the use of a high capacity oil pump, the competition regulator allows oil pressure in the system to reach 105-115 psi. It is also recommended to shim the front pressure regulator 1/8" to ensure it does not limit system pressure.
See below for shimming details.
Mazda has stopped making these, so we are now making them. Regulated PSI Rating: No Shims: 90psi One Shims: 110psi Two Shims: 120psi Three Shims: 135psi A less expensive alternative is to use the 3rd gen oil pressure regulator, which allows 90-100 psi if you aren't already using it.
Mazda# 4352-14-250 Racing Beat# 11812
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