GM Duramax 6.6L Downpipe-Back Race Exhaust (2011-2015)

Vehicle Fitment

This 4" or 5" Downpipe-Back Race Exhaust System is specially designed for 2011-2015 Chevrolet Silverado and GMC Sierra 2500/3500HD models with the 6.6L Duramax LML engine.

However, it does not fit Cab & Chassis trucks or late-model 2015 trucks with a 3-bolt flange. Always ensure you verify fitment before purchase.

Performance and Application

By removing both the catalytic converter and DPF filter, this system enhances exhaust flow significantly. As a result, you will notice improved fuel efficiency and greater engine power. The larger 4" or 5" stainless steel piping ensures better airflow, reducing exhaust gas temperatures. Moreover, the straight-through design helps maximize flow, making it perfect for off-road and competition use.

Features

This race exhaust system offers several advantages, especially for Duramax owners looking to boost performance:

• Durable stainless steel piping to withstand harsh conditions
• Available in 4" or 5" diameters to match different performance requirements
• OE-style hangers provide an easy, secure installation
• Straight-through design maximizes exhaust flow, helping the engine perform efficiently
• No bungs, making this system ideal for off-road applications and competitions

Installation Considerations

The Duramax LML 4" Race Exhaust system is intended for off-road use only and requires race tuning to deliver optimal performance. The package includes all necessary hardware and clamps for easy installation. While you can install it yourself, professional installation is recommended for the best fit and tuning results. Some modifications may be required based on your vehicle configuration.