AP Exhaust 700303 Exhaust Muffler

AP Exhaust 700303 Muffler for GM Trucks and SUVs

AP Exhaust 700303 is a direct-fit exhaust muffler built for select Chevrolet, GMC, and Cadillac applications from 1999-2007. It uses an aluminized steel oval body with a baffled, OE-comparable sound level for drivers replacing a worn factory muffler on Silverado 1500, Sierra 1500, Tahoe, Yukon, and related models.

Key Features

• Part number 700303 from AP Exhaust
• Oval muffler with a 23-inch body length and 27-inch overall length
• Aluminized steel body for everyday corrosion resistance
• Baffled muffler design with OE-comparable sound level
• Single 2.75-inch center lower inlet and single 2.75-inch right upper outlet
• Direct-fit layout for select Chevrolet Silverado 1500, GMC Sierra 1500, and Cadillac Escalade applications

Detailed Description

AP Exhaust 700303 is part of the MSL series and is configured as a regular-grade, non-tunable muffler with a pipe inlet and pipe outlet. The center lower inlet and right upper outlet match the factory-style routing used on many GM truck and SUV exhaust systems, making it a practical replacement for vehicles that need an OE-style exhaust muffler without changing the original exhaust character. This part number 700303 is listed for 1999-2006 Chevrolet Silverado 1500, 1999-2006 GMC Sierra 1500, 2000-2006 Chevrolet Tahoe, 2000-2006 GMC Yukon, 2000-2006 Chevrolet Suburban 1500, 2000-2006 GMC Yukon XL 1500, 2002-2006 Chevrolet Avalanche 1500, and 2002-2005 Cadillac Escalade, plus 2007 Silverado 1500 Classic and Sierra 1500 Classic applications.

Common Reasons to Replace

• Rust-through or case deterioration in the muffler body
• Exhaust noise increase from a failing factory muffler
• Restricted exhaust flow caused by internal damage or corrosion
• Broken or weakened original welded muffler assembly
• Need for an OE-style replacement on Silverado 1500 and Sierra 1500 platforms

Installation Notes and Tips

Verify inlet and outlet orientation before installation: 2.75-inch inlet, 2.75-inch outlet, center lower inlet, and right upper outlet. This muffler is listed for direct-fit applications, and several OE systems were welded assemblies, so related exhaust components may need replacement during service. Confirm vehicle year, make, model, and body configuration before ordering, especially on 2007 Classic and short-bed/long-bed truck applications.

Quality Assurance

AP Exhaust 700303 is an aluminized steel muffler from the MSL series, built to OE-style dimensions and sound characteristics for select GM truck and SUV fitments. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.