Fleece MAP Sensor Spacer with Boost Reference Port (FPE-L5P-MAP-SPR) for 2017-2024 Duramax L5P

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The Fleece MAP Sensor Spacer with Boost Reference Port (FPE-L5P-MAP-SPR) is an upgrade for 2017–2024 Duramax L5P diesel engines that installs between the factory MAP sensor and intake manifold. It provides a boost reference point without modifying factory parts, making it ideal for external boost applications like turbo controllers or gauges. Featuring a built-in 1/8” NPT port, it offers easy integration and is made from durable materials to handle high boost and harsh conditions while preserving OEM sensor function.

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Description

The Fleece MAP Sensor Spacer with Boost Reference Port (FPE-L5P-MAP-SPR) is a precision-engineered upgrade designed for 2017-2024 Duramax L5P diesel engines. This spacer installs between the factory manifold absolute pressure (MAP) sensor and the intake manifold, creating a secure and reliable boost reference point without the need to drill or modify factory components. Ideal for applications requiring an external boost signal—such as aftermarket turbo controllers, boost gauges, or water-methanol injection systems—the spacer features a built-in 1/8” NPT port for easy integration. Constructed from high-quality materials to withstand high boost pressures and harsh engine environments, the Fleece MAP Sensor Spacer ensures a clean, professional installation while maintaining OEM sensor functionality and performance.

Additional information
Weight 2 lbs
Dimensions 6 × 6 × 3 in
Fitment

Fitment

  • 2017 GM Silverado/Sierra 2500/3500 6.6L L5P Duramax
  • 2018 GM Silverado/Sierra 2500/3500 6.6L L5P Duramax
  • 2019 GM Silverado/Sierra 2500/3500 6.6L L5P Duramax
  • 2020 GM Silverado/Sierra 2500/3500 6.6L L5P Duramax
  • 2021 GM Silverado/Sierra 2500/3500 6.6L L5P Duramax
  • 2022 GM Silverado/Sierra 2500/3500 6.6L L5P Duramax
  • 2023 GM Silverado/Sierra 2500/3500 6.6L L5P Duramax
  • 2024 GM Silverado/Sierra 2500/3500 6.6L L5P Duramax
Installation

Installation

Installation Instructions

Problem: Because of the direct placement of the MAP sensor into the intake air stream from the factory, soot buildup becomes an ongoing maintenance problem. This requires the sensor to be routinely cleaned or replaced.

 

Solution: The Fleece Performance MAP sensor spacer moves the sensor from the direct intake air stream to reduce soot buildup over time and eliminate the need to routinely clean or replace the sensor.  The spacer block also integrates a 1/8″ NPT port to allow for installation of an auxiliary boost pressure sensor. Kit includes mounting block, fastner, sealring, and O-ring port plug. 

About brand
Fleece Performance Engineering is a diesel performance manufacturer focused on reliability and precision engineering. The company designs parts that solve common diesel issues while supporting added power. Fleece products support daily driving, towing, and performance diesel trucks. Fleece engineers fuel system components, turbochargers, electronics, and emissions-compliant upgrades in house. Their parts improve efficiency, drivability, and long-term engine protection. Each product is tested for proper fit and consistent performance. Diesel owners trust Fleece for dependable upgrades. Whether maintaining a work truck or building for performance, Fleece delivers proven solutions designed for real-world use.
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