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    Home / Billet differential covers / BMW E30 188mm Billet diff cover
    Billet rear cover for E30 differential
    E30 finned diff cover
    Billet rear cover for E30 differential
    E30 finned diff cover

    BMW E30 188mm Billet diff cover

    RD7008

    699,00€499,00€
    Color
    Black
    Silver

    RacingDiffs Billet Diff Cover for BMW E30 — Cooling, Strength, Reliability

    Enhance the performance and durability of your BMW E30 with the RacingDiffs Billet Differential Cover, engineered to optimize oil flow and cooling while reinforcing the diff housing. Delivered as a complete kit with premium components—no extra purchases required.

    E30 billet differential cover by RacingDiffs with enhanced cooling and upgraded bushings – 3 essential features you need to look for.
    Key Features
    • Enhanced oil-flow design: Unique internal profile accelerates oil circulation, cutting temperature by ~15% on average (validated in simulation and real-world tests).
    • Cooling-system ready: Three M16×1.5 ports support direct plumbing to an external oil cooler—ideal for endurance/extended track use. No welding or mods required.
    • Forged strength: Base plate in 7075-T6 forged aluminum for exceptional stiffness and durability.
    • Powerflex bushings included: Superior NVH control and stability under load.
    • Complete installation kit: Side mounts with secondary mount brackets, sealant rubber gasket, and all required bolts/fasteners.
    • Customization option: Add a personal print—specify your request at checkout.
    Performance Benefits
    • Lower oil temps for more consistent diff performance on street and track.
    • Improved reliability under high load, drifting, and long sessions.
    • Stronger mounting and reduced bushing deflection for sharper driveline response.
    • Plug-and-play cooling capability without custom fabrication.
    Technical Specs / Installation Tips
    Material & finish Forged 7075-T6 aluminum base plate, precision-machined; supplied with premium hardware.
    Cooling ports Three ports, thread M16×1.5, for feed/return/sensor or breather (as configured).
    Bushings Powerflex bushings included for vibration control and stability.
    Included hardware Side mounts & secondary mount brackets, sealant rubber gasket, bolts and fasteners.
    Install notes Clean mating surfaces; follow torque specs for mount and cover fasteners; verify clearance for cooler lines if used. Re-torque after first heat cycle.
    Video See our demonstration for testing methodology and performance gains (oil temp drop, flow behavior).
    Fitment

    BMW E30 chassis (all body styles), 188mm differential size. Designed as a direct replacement diff cover; supports external cooler plumbing where desired.

    +320i M20
    +320is S14
    +323i M20
    +324td M21
    +325e M20
    +325i M20
    +325ix M20
    +M3 S14

    *If your build uses non-standard differential/cover combinations, confirm mounting pattern and clearance before ordering.