AP Exhaust 700399 Exhaust Muffler - Front

AP Exhaust 700399 Muffler for Toyota Sienna

AP Exhaust 700399 is a direct-fit exhaust muffler for select Toyota Sienna front applications. It uses an oval aluminized steel body with a baffled muffler design and OE-comparable sound level for a factory-style exhaust repair.

Key Features

• Direct-fit exhaust muffler for select Toyota Sienna front positions
• Oval body construction in aluminized steel
• Baffled muffler type with OE-comparable sound level
• Center inlet and right-center outlet layout
• 2.25 in. inlet and 2.25 in. outlet pipe connections
• AP Exhaust part number 700399

Product Details

This AP Exhaust muffler is built for front-position Toyota Sienna exhaust service where the original system used a welded assembly. The MSL series design measures 22 in. body length, 26 in. overall length, 10.5 in. body width, and 4.06 in. body height, giving it the proportions needed for a direct replacement in the listed applications. The aluminized steel body provides a practical balance of corrosion resistance and value for everyday exhaust repair. AP Exhaust 700399 is listed for 1998-2003 Toyota Sienna front applications, including 1998, 1999, 2000, 2001, 2002, and 2003 model years with the noted build-date and California exclusions.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Exhaust noise from a worn or damaged muffler
• Rust-through or corrosion in the original muffler body
• Fitment issues when replacing a welded OE muffler assembly
• Factory exhaust tone that has become louder than normal
• Front exhaust section repair on a Toyota Sienna

Installation Notes and Tips

Verify the vehicle year, build date, and California emissions notes before ordering. This muffler uses a center inlet and right-center outlet with 2.25 in. pipe connections, so confirm the existing exhaust routing and pipe size on the vehicle before installation. Because the OE system was a welded assembly, related exhaust components noted in the application should be inspected and replaced as needed during service.

Quality Assurance

AP Exhaust 700399 is a regular-grade replacement muffler from the MSL series, built with aluminized steel and an OE-comparable sound profile for the listed Toyota Sienna applications.