Dieselr Aluminized 4" Cat Back Exhaust Single | GM 2500/3500 6.6L DURAMAX LML 2011-2015

The Dieselr Aluminized 4" Cat Back Exhaust Single (2011–2015 6.6L Duramax LML) is engineered for GMC Sierra and Chevy Silverado 2500/3500 HD owners who expect dependable fitment, efficient flow, and long-term reliability. Built from 4-inch heavy-gauge aluminized steel, it increases exhaust velocity, reduces EGTs, and delivers a refined diesel tone that means business.

Each Dieselr system is mandrel-bent for unrestricted flow and precision-welded for leak-free strength. The aluminized finish resists heat and corrosion to withstand daily use, towing, and harsh environments. With OEM-hanger alignment, installation is straightforward and factory-clean with no cutting required.

Proven on real Duramax LML platforms, this Dieselr system delivers the sound and strength serious truck owners expect—durable, efficient, and built from steel that works as hard as you do.

Key Features

• 4" aluminized steel construction for strength and corrosion resistance
• Mandrel bends for consistent, smooth exhaust flow
• OEM-hanger fitment for easy, secure installation
• Tested on 6.6L Duramax LML trucks for verified fit and performance