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Boundary oil pump gears are 100% manufactured in our Dallas, Texas, production facility. They start by quenching their Chromoly billets from extreme heat and then temper them to a tough, indestructible core. After machining, they apply our ColdFlow surface hardening process and complete it to a Mirror Finish. What does all this give you? First, it gives you a pump with stability over 9000 RPM, proven over 900whp, with higher efficiency, less friction, and backed by one of the industry’s best warranties.



  • Mirror Finished and Surface Hardened
  • Surface Ground gears for the ultimate in fitment and performance
  • Indestructible core
  • Inner and outer gear set included
  • Unique race-inspired gerotor design
  • Symmetrical tooth profile eliminates the gear’s weak spot making our gear sets indestructible
  • Each set hand, machine, and hardness inspected with Blueprinting Report


Optional Martenwear Treatment:

MartenWear heat treats the exterior surface of the Gears to be extremely hard and long-wearing. This surface is more robust against debris ingestion and has proven to be wear-free in all applications up to and beyond 13000 RPM. A true fit and forget part!

Boundary Uprated Oil Pump Gears - R53 Mini Cooper S


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