Supertech BMW S54 88mm Dia 1.2mm Thick Cooper ring Head Gasket turn14-product-not-found-review 10-percent inner diameter increase from

10-percent inner diameter increase from stock for superior airflow

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The Exhaust Backpressure install kit is engineered to provide backpressure readings without sacrificing sensor longevity due to extreme operating conditions

Supertech BMW S54 88mm Dia 1.2mm Thick Cooper ring Head Gasket turn14-product-not-found-review 10-percent inner diameter increase fromManufacturer Part # : HG BMW S54 88 1. 2T Product Description Short Supertech BMW S54 88mm Dia 1. 2mm Thick Cooper ring Head Gasket