Boundary L15B7-OPG-M MartenWear Billet Oil Pump Gear for Honda Civic Si 1.5L I4

Vehicle Fitment

• Honda vehicles equipped with the L15B7 1.5L Turbocharged I4 engine, including 2017-2020 Civic Si (10th gen) and 2022+ Civic Sport/EX/Touring (11th gen, L15B7 w/ VTEC)

Fitment Notes

• Engine-specific fitment - confirm your engine code (L15B7) rather than relying on trim/year alone, as engine codes can vary by build and region
• Not for L15BA, L15CA, or other L15-family variants

Features

• MartenWear surface hardening for added wear resistance over standard billet gears
• Indestructible chromoly billet core, quenched and tempered
• Mirror-finished, surface-ground gears for optimal fitment and reduced friction
• Race-inspired gerotor design for maximized oil flow and strength
• Rated for stable oil pressure above 9,000 RPM
• Proven in builds exceeding 1,000 whp

Specifications

• Material: Chromoly billet steel
• Surface treatment: MartenWear hardening, mirror finish
• Engine application: Honda L15B7 1.5L I4
• Manufactured: Dallas, Texas, USA

Included Components

• 1x Boundary Billet Oil Pump Gear Set (inner and outer gears, matched pair)

Product Description

The Boundary L15B7-OPG-M is a MartenWear-treated billet oil pump gear set built for L15B7 owners pushing well past stock power levels. Machined from chromoly billet and hardened through Boundary's ColdFlow surface treatment process, it's designed to maintain stable oil pressure at engine speeds over 9,000 RPM - well beyond what the factory gerotor set can reliably handle under sustained boost.

Each set is hand-matched, machine-inspected, and backed by a blueprinting report, with surface-ground gears for tight tolerances and reduced internal friction. It's aimed at builds targeting serious horsepower (Boundary cites reliability up to 1,000+ whp) rather than mild street tunes, making it a common choice for turbo Civic Si and Sport builds heading into higher-boost territory.