Underdog Racing Development is a performance parts supplier, manufacturer and development company specializing in Toyotas


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  • URD Spec-U Exhaust Release

    URD is proud to announce our new Spec-U exhaust system for the 2005-2013 Tacoma V6 and 2003-2009 4Runner. This is the ultimate performance exhaust system for your truck and it is ready for the race track. The Spec-U system enhances power and torque throughout the RPM range and has a completely unique exhaust note.

    Hear it on this product video
  • 2TR-FE Supercharger Kit

    URD has released this advanced supercharger system for the 2005 and later Tacoma with the 2.7L 2TR-FE 4 cylinder engine. The before dyno using a DynoJet chassis dyno was 117 RWHP. The after dyno was 248 RWHP. The after dyno was done without the catalytic converters installed and the Stage 2 pulley.

    Check out the dyno chart & video
  • Spec-U Equal Length Headers

    URD is proud to announce our new Spec-U True Equal Length Long Tube Header for the 1GR-FE 4.0L V6 engine. We have tested different tube lengths in an effort to maximize the low end torque production without sacrificing the upper end power gains. The equal length design also improves the sound or tone of the exhaust.

    Read the reviews

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This just in from a customer:

Sprint Booster and its effects in a 2010 Tacoma 6 speed

Vehicle: 2010 X-Runner, S/C, 2.85 pulley, Pressurized CAI, 3.73 gear.

Don’t listen to the “just press harder on the gas” argument. While that sounds logical, it is not a relevant statement once you see what Sprint Booster actually does. Its all about power-delivery. I liken it to riding a 350cc 4-stroke motorcycle vs a 350cc 2-stroke. The difference in the way the power comes on is huge.

After resigning myself to the throttle lag/rev-hang and related herky-jerky shifting the Sprint Booster was a revelation. The biggest issue now is unlearning my old shift habits from the horrible stock throttle setup.

As far as bang-for-the-buck it might actually surpass the Supercharger and the 3.73 gear as a clear performance enhancement.

B. Curtas
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1 week ago

URD was able to locate a Tacoma Fit Kit for the discontinued TRD supercharger system for the 4.0L V6, so we have ONE LAST NEW TRD SUPERCHARGER KIT FOR SALE. JUST ONE and ONE ONLY. First come, first serve.

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3 weeks ago


Use coupon code THANKS2015 for 15% off. Does not apply to things already on sale.

Whats new??

URD is now a stocking warehouse distributor for Magnuson Superchargers. We have Magnuson Supercharger Kits in stock for the 5VZ-FE 3.4L, 1UZ-FE 4.5L Landcruiser, and 3UR-FE 5.7L Tundra!! Sorry, the sale does not apply to them.

URD has finally gotten all the ECU connectors we need to make a production run of our UCON-Ethos EMS for the 2009-2015 Tacoma V6 and 2010+ FJ and 4Runner. Look for those applications to start shipping around the end of December!!! This has been a long painful process, but it is finally happening!!!

Once we have the UCON-Ethos done and shipping for the 2010+ 4Runner and FJ, we can finally put our Whipple TwinScrew Supercharger kit for those trucks into production. Yes, it is as AWESOME as you have been hearing....

Got a couple of other very cool things almost ready. Stay U-Tuned!!!
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1 month ago

Coming soon!!! ... See More

1 month ago

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Tuning has never been easier.

UCON-EMS Advanced Engine Management for Toyota 1GR-FE 4.0L V6

Tap into your engine's potential

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