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ISR Performance Turbo Oil Restrictor Inspired Overland 2020 GMC Sierra 2500 HDISR Performance oil restrictor Oil Restrictor for use with ISR ball bearing turbos oil. **NOT FOR USE WITH ISR JOURNAL BEARING TURBOS** (IS RS3871 & IS RST25 28) Specifications: . 036" restrictor 7 16 24 thread 3an male Legal only for use in competition vehicles which may never be registered, licensed, and or used on public streets or highways; and also for use in other exempted vehicles.