AP Exhaust 700373 Exhaust Muffler - Rear

AP Exhaust 700373 Muffler Overview

AP Exhaust 700373 is a direct-fit exhaust muffler for select rear applications on 2000-2005 Buick LeSabre and 2000-2005 Pontiac Bonneville models with single exhaust. It uses an oval, baffled design with OE-comparable sound level to support a factory-style exhaust tone and fitment.

Built from aluminized steel, this AP Exhaust muffler features a 4.5-inch body height, 11-inch body width, 15-inch body length, and 19-inch overall length. The inlet is a 2.25-inch pipe at the right-center location, and the outlet is a 2-inch pipe at the center location.

• Part number: 700373
• AP Exhaust MSL series muffler
• Oval muffler body with baffled internal design
• Aluminized steel construction for exhaust system service
• OE-comparable sound level
• Direct-fit rear muffler for single-exhaust applications
• Compatible with 2000-2005 Buick LeSabre, rear
• Compatible with 2000-2005 Pontiac Bonneville, rear

Fitment Details

• Fits 2000-2005 Buick LeSabre, rear. Notes: DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.; Single Exhaust.
• Fits 2000-2005 Pontiac Bonneville, rear. Notes: DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.; Single Exhaust.

What This Muffler Helps Address

• Exhaust noise that has become louder than factory levels
• Corrosion-related muffler replacement needs in aluminized-steel exhaust systems
• Fitment issues when replacing a welded OE rear muffler assembly
• Restoring a factory-style exhaust path on Buick LeSabre and Pontiac Bonneville models
• Replacing a damaged or rusted rear muffler on single-exhaust vehicles

Installation Notes and Tips

Verify inlet and outlet diameters, body dimensions, and rear-position fitment before installation. This muffler is specified for vehicles where the OE system was a welded assembly, so matching the existing exhaust layout is important for proper installation. For 2000-2005 Buick LeSabre and 2000-2005 Pontiac Bonneville applications, inspect adjoining exhaust components and replace any worn parts noted in the vehicle-specific service notes to complete the repair correctly. Part number 700373 is intended for direct-fit rear installation on the listed single-exhaust applications.

Quality Assurance

AP Exhaust 700373 is part of the MSL series and is built to OE-comparable sound expectations with application-specific dimensions for the listed Buick and Pontiac vehicles. The aluminized-steel construction and baffled design support a service replacement focused on factory-style fit and exhaust tone.