Fleece Performance Air Intake Kit

Fleece Performance Air Intake Kits: Diesel-Engineered Airflow Solutions

Fleece Performance Engineering has built its reputation as one of the most respected names in the diesel aftermarket by identifying real-world weak points in factory hardware and engineering purpose-built solutions. Their air intake kits are a perfect example of this philosophy — not just a cold-air upgrade for horsepower bragging rights, but a comprehensive fix for a well-documented OEM failure point that can cause catastrophic engine damage if left unaddressed.

What Makes Fleece Performance Intake Kits Different

Fleece Performance Engineering is a customer-centric diesel performance company that specializes in the development and manufacturing of innovative and extremely forward-thinking products to improve upon the performance and reliability of your Cummins, Duramax, or Powerstroke. When it comes to intake components, that mission is clearly on display.

Their flagship offering in this category is the Intake Horn and Grid Heater Upgrade Kit for the 6.7L Cummins. Designed to replace the restrictive factory grid heater plate, this upgrade increases airflow, enhances throttle response, and removes the risk of catastrophic engine damage caused by grid heater failure. The OEM grid heater design is a known problem — the Cummins grid heater bolt can wear down, drop into the intake, and get ingested into the engine, potentially resulting in a very expensive repair or worse.

Key Features of Fleece Performance Intake Kits

• The direct replacement, factory-appearing intake horn and high-flow intake plate increase overall engine airflow and replace the OEM style grid heater with a robust coil heating element.
• One kit fits 2007.5–2024 2500/3500/4500/5500 6.7L Cummins engines — the broadest coverage of any kit on the market.
• No need to hunt down gaskets separately — the kit includes everything you need, with gaskets for the intake runner, intake horn, throttle valve, EGR valve, and EGR crossover tube for both pickup and cab-and-chassis model trucks.
• Clearly labeled hardware kits make it easy to identify all necessary parts for installation, and labeled electrical connections make install straightforward — no guessing which end goes where.

Cold-Weather Performance

For diesel owners in harsh climates, Fleece takes it a step further. For cold-weather customers who experience sustained temperatures below 23°F (-5°C), the optional cold weather kit adds an additional heating element — together this combination provides proven startability down to -35° Celsius. Compared with other grid heating kits on the market, the Fleece Performance kit achieves the same levels of cold-temperature startability with lower wattage and less strain on the grid heater relay.

A Brand Built on Solving Real Diesel Problems

Many of Fleece's products are designed around weak-point correction, cleaner routing, stronger fuel delivery, and better long-term support for daily-driven and towing-focused trucks. The air intake kit lineup exemplifies this ethos — whether you're building a reliable tow rig or a performance-driven diesel, this high-flow intake plenum is a must-have upgrade for long-term durability and improved engine efficiency.

Explore the full lineup of Fleece Performance air intake kits, or browse the complete Fleece Performance brand catalog to discover their broader range of diesel performance solutions — from Cheetah turbos to PowerFlo lift pumps and beyond.