Flo~Pro 4" Cat Back Single Exhaust | 2011-2015 Chevy/GMC 2500HD/3500HD 6.6L Duramax

The Flo~Pro 4" Cat Back Single Exhaust is a direct-fit exhaust upgrade built specifically for the 2011-2015 Chevy/GMC 2500HD/3500HD 6.6L Duramax. Fabricated in Alberta, Canada from U.S.-sourced heavy-gauge steel tubing, it replaces restrictive factory piping with a full 4" flow path to help lower EGTs, sharpen throttle response and give your diesel a deep, clean, aggressive tone.

What This Cat Back Does

A cat-back system replaces the exhaust from the back of the catalytic converter to the tailpipe, opening up the rear of the system for better flow and a stronger diesel tone.

Build It Your Way

This kit is available in the following configurations. Choose the options that fit how you drive:

Material

• 16-Gauge Aluminized Steel: heavy-gauge U.S. steel with a corrosion-resistant aluminized coating. Tough, great value, and ideal for daily driving and towing.
• T409 Stainless Steel: premium U.S.-sourced stainless for superior corrosion resistance and long life through salted winter roads and high-heat towing.

Muffler

• With Muffler: a high-flow muffler keeps the sound deep and aggressive while taking the harsh edge off at highway cruise.
• No Muffler: a straight-through pipe for maximum flow and the loudest, most aggressive diesel sound.

Fitment & Specs

• Years: 2011-2015
• Make: Chevy/GMC
• Models: 2500HD, 3500HD
• Engine: 6.6L Duramax
• Configuration: Pickup
• Tubing Diameter: 4"
• Exhaust Style: Single exit

Why Flo~Pro

• Manufactured in Alberta, Canada, never offshore
• U.S.-sourced 16-gauge aluminized or T409 stainless steel tubing and steel hangers
• Model-specific fitment, adjusted for each production change so it bolts up right the first time
• Pre-welded contour bends and contour-bent hangers for OE-style alignment
• Upgraded flanges and lap-joint clamps for a secure, leak-free install
• Improved airflow and lower EGTs, especially under load and when towing
• Signature Flo~Pro tone: deep, clean and aggressive, never raspy or hollow

Off-Road / Competition Use Only. This product removes or modifies factory emissions equipment and is not legal for use on vehicles operated on public roads. It is intended for off-road and competition vehicles only. The buyer is responsible for complying with all applicable laws in their jurisdiction.