Flowmaster 40 Series Delta Flow Chambered Muffler 2024-gmc-sierra-1500-sle-esi6031047 high-quality materials and state-of-the-art manufacturing

high-quality materials and state-of-the-art manufacturing make it easy to see why BORLA® is THE choice of performance enthusiasts worldwide

A more modern tent shape delivers an extra spacious interior and more living space for you and your gear

5" backspacing) with 37x12

allowing you to install up to a 33x11

Flowmaster 40 Series Delta Flow Chambered Muffler 2024-gmc-sierra-1500-sle-esi6031047 high-quality materials and state-of-the-art manufacturingThis two chamber design incorporates Flowmaster's Delta Flow technology. The Delta deflectors generate increased scavenging for better performance and reduced interior sound. Milder exterior tone and reduced interior resonance over standard 40 series. Constructed of 16 gauge 409S stainless steel and fully MIG welded for maximum durability.