Powertrain

Engine, Drivetrain, Exhaust, Clutch, etc

  1. N/A Mods & Tuning

    Questions, Comments, Problems, etc about drivetrain modification issues.
    3,261
    51,980
    throwinsparksatu Latest: 70mm vs 76mm throttle body upgrade throwinsparksatu, Aug 6, 2017
    RSS

  2. F/I Mods & Tuning

    Discussion Turbochargers, Superchargers, NOS and general FI issues.
    2,028
    46,969
    Torspd Latest: Re-Installing My Supercharger Torspd, Sep 21, 2017 at 12:03 AM
    RSS

  3. Fluids & Maintenance

    Oil, Filters, Transmission Fluid, Brake Fluid, etc.
    529
    7,091
    wolfpack_5150 Latest: If you have a supercharger, VISUALLY check your intercooler coolant!!! wolfpack_5150, Jan 31, 2017
    RSS
Toggle Width

  • About Us

    XR-Underground is a dedicated community of Toyota X-Runner enthusiasts that was launched in January 2007. X-Runner Underground.com, referred to as XRU by our regular members, offers an active discussion forum, group events, specialty merchandise, a welcoming community of owners and the most information you can find about the Toyota X-Runner on the internet!

  • Quick Navigation

    Open the Quick Navigation

  • Like us on Facebook

    X-Runner Underground

  • Your donations keep XRU going

    XRU is a forum for the users, by the users. We receive very limited funding from vendors so we really rely on donations to cover our operating costs and to provide products and giveaways at events. Every dollar helps!

    If you are able to donate, we'd really appreciate your help.