GMC/Chevy, 2001-2006, 8.1L, Stainless - Truck Cat-Back Dual Exhaust Kits

The MPI Exhaust Kit is a cat-back exhaust system engineered explicitly for the older 8.1L trucks with a Gas engine. It aims to enhance overall vehicle performance. This kit delivers notable improvements in horsepower and torque, and helps improve fuel efficiency, as verified by extensive 3rd-party dyno testing.  Additionally, it is 50-state emission-compliant.

Key Features

• Patented Pulse Chamber Technology: Eliminates all in-cab droning common with other aftermarket exhausts.
• High-grade stainless-steel Construction: Formulated for high heat resistance and durability against road salts.
• Straightforward Installation: Welding is required; it utilizes factory hanger locations and has detailed trimming instructions for different wheelbases.

Performance Benefits – 8.1L

• Horsepower Gains: +20 hp 
• Torque Gains: +16 lb-ft
• Fuel Efficiency: Average improvement of 1-2 MPG
• Heat: Reduces under-hood manifold temperature by 150 degrees
• Sound Quality: Aggressive yet refined exhaust tone with no in-cab droning.

Fitment

• Make: Chevy & GMC
• Model Years: 1999-2006
• Chassis: 2500 - 3500
• Engine: 8.1L
• Wheelbase: Compatible with all wheelbases

Detailed Specifications 

• Material: 409 Stainless 
• Installation: Weld-on system, direct fit to factory system.
• Hardware: Includes all necessary hardware for installation.
• Design: Compatible with the factory spare tire.
• Tubing Size: Dyno-proven optimal size for performance.
• Tips: 409 SS Large 3.5" x 12" long tips for a refined appearance.

Sound Quality: 

• MPI Turbo Series: Our Turbo series Muffler combines MPI benefits with a pleasant, mellow exterior tone that is slightly deeper than the stock system.
• MPI Performance: Our Performance Muffler provides a crisp, aggressive tone that remains balanced. 

Patented Technology

• Exhaust Pulse Chamber (Pat. 11713700): It is guaranteed to have no drone and optimizes exhaust flow and overall performance.

Warranty

• MPI Exhaust has A Limited Lifetime Warranty for all Stainless Products. 

Instructions

G551 & G552