Pacbrake Inline Mount PRXB Exhaust Brake Kit, 2001-2005 LB7/LLY

Part# C40075

$1,308.38 Includes Free Shipping.

WARNING: Cancer and Reproductive Harm - www.P65Warnings.Ca.Gov

Fits: 2001 thru 2005 Chevy Silverado/GMC Sierra 2500HD/3500HD LB7/LLY Duramax Diesel

Introducing Pacbrake's In-Line Mount PRXB High-Performance Exhaust Brake Kit tailored for GMC 2001-2005 6.6L Duramax 32 Valve Engine paired with the Allison 1000 Series Automatic Transmission, excluding the optional 2nd alternator. This air actuated system comes equipped with an air tank, hose, and necessary accessories, ensuring a seamless installation process. Boasting a patented 90-degree non-contacting butterfly valve, this exhaust brake maximizes backpressure while preventing seizing, providing 50% more braking power at lower RPMs. Engineered with a spring-controlled pressure-regulated mechanism, it safeguards against engine overpressure, while the Arcor nitride coating enhances durability, corrosion resistance, and lubricity. With Pacbrake's PRXB Exhaust Brake, experience unrivaled braking power precisely where it's needed, offering optimal holdback within the 1400-1800 RPM range, delivering unmatched performance and reliability.


  • Delivers the strongest braking horsepower, greatest speed reductions & shortest stopping distances possible without the use of service brakes
  • 50 percent more braking power at lower RPM's
  • PRXB gives you the best holdback in the 1400-1800 RPM range
  • Protects from engine overpressure 
  • Arcor nitride coating for increased wear resistance 
  • Longer lasting brake with increased performance 
  • Limites Warranty for Controller and Brake 


  • Air tank 
  • Hose and accessories 
  • Necessary hardware 


  • Trucks with the 2nd alternator will have to fabricate their own mounting for the compressor
  • All these kits are for vehicles with factory exhaust systems. Aftermarket 4'' O.D. Exhaust systems will need aftermarket adapters (requires 2): C11342

Install Instructions

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