Powertrain

Engine, Drivetrain, Exhaust, Clutch, etc

  1. N/A Mods & Tuning

    Questions, Comments, Problems, etc about drivetrain modification issues.
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    51,975
    bluedemon Latest: Cams? "Mostsouthernx""BALBOA" bluedemon, Jul 20, 2017
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  2. F/I Mods & Tuning

    Discussion Turbochargers, Superchargers, NOS and general FI issues.
    2,025
    46,946
    NHXRUNNER Latest: Which Headers to buy NHXRUNNER, Jul 20, 2017
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  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
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    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!

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