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Welcome to Fleece Performance!

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Custom Engine Builds and Dyno Tuning

Built by the Best in the Racing Industry:


Moving to one of the most prestigious racing districts in the world has provided Fleece Performance with invaluable  relationships that will provide a catapult into the next generation of diesel performance. One such relationship is with our engine builder. With over 70 years of building custom racing engines for virtually all forms of racing you can be confident that it will be done right – the first time.

Testing and Validation:

When it comes to staying at the top of the diesel performance industry, testing and validation of new engine configurations is paramount. Fleece Performance is committed to providing the highest quality products that have been proven to perform. That’s why we have teamed up with the best in the racing industry to perform testing, validation, and tuning on the dyno. We are continuously learning how to make more from less, and do it reliably. We don’t just say it…we prove it on the track too.

CumminsEngine Manufacturing:

With the ability to custom build and dyno tune Cummins and Duramax engines, Fleece Performance can provide you with a high performance engine package shipped to your door.