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We currently offer 24 different gear ratio spreads for your high performance vehicle.
Thanks for your interest in Underground Racing Powertrain Technologies.
As you can imagine, it isn't easy getting a transmission to live behind an Underground Racing engine making anywhere from 1,300 to over 2,000 hp. Nonetheless, we've been pioneering modifications to the Graziano Transmission Group box ever since we overpowered the first one nearly four years ago.
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Interested In A Turbo System?
At Underground we don't sell off-the-shelf, mass produced turbo kits. All of our twin turbo systems are custom tailored to meet the specific needs of each customer using the latest cutting edge technology available. Each system is engineered and custom fabricated around your performance needs.
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Supercharge Your Ride
When you're looking for ultimate supercharging performance, reliability and quiet operation look no further than the Paxton NOVI centrifugal supercharger. Using the basic Paxton kit with our custom modifications there is no other supercharger system on the market that can come close to the PROVEN performance of an Underground Supercharger system for your Viper.
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Keeping it Natural
If you are looking to keep it simple we have many naturally aspirated performance combinations available.
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Short Block
With years of experience we have designed, tested, and PROVEN our engine combinations to be the BEST! Every Underground Racing engine is professionally blue printed, torque plated, line bored, honed, assembled and inspected by highly experienced technicians.
Are you in a RUSH? We stock completed short blocks ready for shipping.
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Exhausted All Your Options?
With any application there are many exhaust options to choose from. At Underground Racing we can supply from the headers to the tail pipes.
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Check Out Our Intake and Throttle Options
At Underground Racing we offer a variety of options for your intake manifold and throttle body needs.
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Fuel Your Passion
Want more power? Then you will need more fuel! We custom build fuel systems to meet the needs of your power requirements.
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Control Your Ride
If you're looking to get maximum traction and ultimate cornering a suspension upgrade is a must. We use top of the line custom valved Penske shock absorbers with custom coil spring rates and custom made canister bracketing for ease of adjustment along with corner balancing to dial in the suspension for maximum performance.
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What Was That Noise?
For extreme power applications you need an extremely strong drivetrain. We stock the industries best drivetrain parts made from the highest quality materials.
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What Makes Everything Work Together?
Tuning and electronics are what bring everything together. Having the proper equipment, hardware, software and an experienced tuner is key to obtaining unbelievable power and torque while still keeping the stock driveability it had from the factory.
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Untouchable Fabrication
When it comes to fabrication, Underground Racing is second to none. Out team of fabricators have played important roles in the automotive industry such as NASCAR, NHRA, Busch, IMSA, SCCA, ARCA, IHRA and many others.
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Performance