Duncan Diesel Power

06/02/2026

As close to “bulletproof” as you can make a 5th gen Cummins engine!

Fleece Performance Engineering coolant bypass and grid heater relocate kits

Valair Clutches billet flex plate

Hamilton cams flat tappet conversion

Power Stroke Products head studs

And a complete bottom end reseal with genuine Cummins parts!

Give us a call if you’re ready to make your 19-24 Cummins not suck!

05/20/2026

Some more Fleece Performance Engineering goodness going in today!

05/12/2026

We have our first order placed we will be keeping these kits in stock!

NOW AVAILABLE! Fleece Performance intake horn and grid heater kit for the 6.7L Cummins!! From the #1 trusted name in diesel performance comes the most complete kit available to address the OEM grid heater nut nightmare. The direct replacement intake horn and high-flow intake plate increase overall engine airflow and replace the OEM style grid heater with a robust coil heating element. Protect your investment with confidence with the latest from Fleece Performance.

Features:
*Eliminates the risk of engine damage from the OE style grid heater nut failure.
*Improves throttle response and airflow with lower intake restriction.
*Allows for reuse of the OE high pressure fuel lines and direct replacement options – no proprietary fuel line problems to worry about.
*The most complete kit on the market - includes all necessary hardware and gaskets.
*High flow 700W coil heater along with a new high flex heater cable and new grounding cable.
*Factory appearance with the highest-level fit and finish.
*Precision machined, cast aluminum high flow intake horn and plate.
*1/8” NPT port for sensor installation.
*Optional, secondary heater for cold weather start-ability down to -35 degrees Celsius.

04/28/2026

Cabs goin up on a Monday!

Call today to get your ride in tip-top shape!

04/14/2026

You vs the guy she tells you not to worry about. Valair Clutches

04/04/2026

Here’s what we’ve been up to during the month of march. Happy Easter everyone!

03/05/2026

WARNING: installation of No Limit Diesel whistler turbocharger may cause driver to be unable to close windows. We love that sweet sweet whistle 💨

03/03/2026

Some projects we’ve been working on recently, a fresh long block for for a 2022 super duty with a spun rod bearing, a Fleece Performance Engineering cheetah turbo for a 2023 L5P duramax, and a compound turbo 6.7 powerstroke build. And of course we had to take a little jab at the Cummins guys while we’re at it!

02/05/2026

L5P cheetahs are here!!! Another top quality part from Fleece Performance Engineering! This will be our go-to L5P charger!!

02/04/2026

Diesel Truck Problems or Performance Goals? We Can Help.

At Duncan Diesel Power, we specialize in diesel pickup truck repair, accessories, and performance upgrades.

Whether your truck needs reliable repairs or you’re looking to improve power and drivability, our experienced team is here to help—no guesswork, no confusing jargon.

🔧 Professional diesel repair
🚛 Performance upgrades & accessories
✅ Honest service you can trust

📍 Duncan, OK
👉 Message us or call today to get started