Fleece Performance Engineering: The Diesel Builder's Guide to CP3 Pumps and Cheetah Turbos

If you've spent any time in the diesel performance world — wrenching on a Cummins, building a Duramax sled puller, or just trying to keep your tow rig running like a beast — you've heard the name. Fleece Performance Engineering is one of the most respected names in heavy-duty diesel performance, and for good reason. Their CP3 fuel pump conversions and Cheetah Turbocharger drop-ins have become go-to upgrades for anyone serious about reliability, power, and putting an end to common factory headaches.

At Urban3D, we carry a curated selection of Fleece Performance parts for 5.9L Cummins, 6.7L Cummins, and LBZ/LMM Duramax platforms. Whether you're replacing a failing CP4.2, building a daily-driver tow truck, or chasing big horsepower numbers, this guide will walk you through what makes Fleece Performance gear worth the investment.

Who Is Fleece Performance Engineering?

Founded in Brownsburg, Indiana, Fleece Performance Engineering has built its reputation on engineering-driven solutions to the diesel community's biggest pain points. Rather than chasing trends, Fleece focuses on building parts that solve specific problems — like the catastrophic CP4.2 fuel pump failures plaguing late-model Powerstroke and Duramax owners, or the sluggish factory turbos holding back stock Cummins trucks.

Every Fleece product is designed, tested, and assembled in-house. That hands-on approach shows up in the small details: tighter tolerances, better-flowing turbine housings, and components that hold up under serious abuse. When diesel guys talk about "buy once, cry once," Fleece is usually in the conversation.

The CP3 Conversion: Why Diesel Owners Are Ditching the CP4.2

Let's start with the elephant in the room. If you own a 2011-2016 6.7L Powerstroke or a 2011-2016 LML Duramax, you've got a CP4.2 high-pressure fuel pump under the hood. And when that pump fails — and it does fail — it can grenade your entire fuel system. We're talking injectors, rails, and lines all contaminated with metal shavings. Repair bills routinely run $8,000 to $12,000.

Fleece's answer? Convert it back to a CP3 — the bulletproof Bosch pump that powered the legendary 5.9L and early 6.7L Cummins engines, plus the LB7 through LMM Duramax trucks.

Fleece Performance Cummins CP3K (5.9L)

The Fleece Performance CP3K conversion isn't just a replacement — it's an upgrade. Designed for 5.9L Cummins trucks, this kit delivers significantly more flow than a stock CP3, supporting larger injectors and higher horsepower builds without running out of fuel up top. If you're planning a serious build (think 600+ horsepower) on your '03-'07 5.9L, the CP3K is one of the smartest insurance policies you can buy.

Best for: 2003-2007 Dodge Ram 2500/3500 Cummins owners chasing big power.

Fleece Performance PowerFlo 750 — 5.9L and 6.7L Cummins

The PowerFlo 750 is Fleece's flagship CP3. Available for both 2003-2007 5.9L Cummins and 2007.5-2018 6.7L Cummins trucks, this 10mm CP3 supports up to roughly 750 horsepower of fueling on a single pump. That's enough to run big single turbos, larger injectors, and aggressive tuning without ever worrying about the fuel system being the bottleneck.

It's a direct fit for stock-replacement applications, meaning installation is straightforward for shops familiar with Cummins fuel systems — no proprietary adapters, no mystery fittings.

Best for: Cummins owners building toward 500-750 horsepower who want a single-pump solution that doesn't require dual CP3s.

Fleece Performance Duramax CP3K (LBZ/LMM-Based)

For Duramax guys running LB7, LLY, LBZ, or LMM trucks — or anyone doing a CP4-to-CP3 conversion on a 2011+ LML — the Fleece Duramax CP3K is the go-to higher-flow option. Built off the proven LBZ/LMM platform, it bolts in cleanly and supports the kind of fuel volume needed for big-injector builds.

Fleece Performance Duramax PowerFlo 750 (LBZ/LMM-Based)

Same idea as the Cummins PowerFlo 750, applied to the Duramax world. 750 horsepower of fueling in a single pump, designed around the LBZ/LMM platform. If you're swapping out a failed CP4.2 on an LML and want to come back stronger than stock, this is the upgrade path.

Best for: LBZ/LMM builders going aggressive, or LML owners doing a CP3 conversion who want headroom for future power adds.

Fleece Cheetah Turbochargers: Wake Up Your Cummins

Stock Cummins turbos do their job, but they're conservative. They spool reasonably well, top out predictably, and leave a lot of horsepower on the table. The Fleece Cheetah Turbocharger is a drop-in upgrade that fixes that — and it's one of the most popular bolt-on power adds in the Cummins world for good reason.

The Cheetah is built around an upgraded compressor wheel, a tighter turbine housing, and Fleece's own balancing process. The result: faster spool, more top-end, lower EGTs under load, and a noticeable improvement in throttle response. It bolts into the factory location, runs the factory actuator, and works with stock or mildly-tuned trucks without any other modifications.

Cheetah Turbocharger for 2003-2004 5.9L Cummins (351-0304)

For early 5.9L common-rail trucks, the Cheetah 351-0304 transforms the lazy stock HE351CW into a quicker-spooling, harder-pulling turbo. Tow guys love it for keeping EGTs in check on grades; performance guys love how much more responsive it makes the truck off-idle.

Cheetah Turbocharger for 2004.5-2007 5.9L Cummins (351-0407)

The Cheetah 351-0407 is the same concept applied to 2004.5-2007 5.9L trucks. Drop-in fitment, factory-style turbo with significantly upgraded internals. If your stock turbo is on its way out, this is the smart-money replacement.

Cheetah Turbocharger for 2007.5-2012 6.7L Cummins (351-0712)

For 6.7L Cummins trucks, the Cheetah 351-0712 gives you the responsiveness the factory Holset HE351VE was missing without sacrificing the variable geometry behavior or the exhaust brake function. It's a perfect upgrade for tow rigs and daily drivers that want a meaningful performance bump without stepping into a full single-turbo swap.

Why Buy Fleece Performance Parts From Urban3D?

We're a South Carolina-based diesel and off-road parts shop with a real focus on quality. We carry Fleece Performance parts because they fit our standards: engineered to solve real problems, built in the USA, and backed by a manufacturer that stands behind their work.

When you order Fleece Performance products from Urban3D, you get:

• Authentic Fleece parts sourced through authorized distribution
• Fast shipping from our network of warehouses across the country
• Real customer support from people who actually know what these parts do
• Manufacturer warranty on every Fleece product we sell

Browse Our Fleece Performance Collection

Whether you're replacing a failed CP4.2, upgrading a tired stock turbo, or building toward your next horsepower goal, Fleece Performance Engineering builds the parts that get you there. Shop our full Fleece Performance collection to see what's in stock and ready to ship.

Got questions about which Fleece part is right for your build? Reach out — we'd rather help you spec the right pump or turbo the first time than have you guess and end up with the wrong part.

Urban3D LLC — South Carolina-based supplier of premium diesel performance, off-road, and fabrication parts. Carrying Fleece Performance, MBRP, BD Diesel, FOX Offroad Shocks, and dozens more trusted brands.