{"product_id":"walker-18921-exhaust-muffler","title":"Walker 18921 Exhaust Muffler","description":"\u003ch2\u003eWalker SoundFX Direct Fit Muffler for Expedition and Navigator\u003c\/h2\u003e\u003cp\u003eWalker SoundFX Direct Fit Muffler Part Number 18921 is a specific-fit exhaust muffler built for select Ford Expedition and Lincoln Navigator applications. It uses an oval steel body with an aluminized finish to support longer service life than low-carbon steel designs, while maintaining a clean OE-style appearance and controlled exhaust tone.\u003c\/p\u003e\u003ch2\u003eSoundFX Direct Fit Construction\u003c\/h2\u003e\u003cp\u003eThe SoundFX Direct Fit line focuses on direct replacement fitment and balanced acoustics. For this application, Walker 18921 uses mechanical interior joints and spun-locked heads for added durability, along with a combination muffler design that supports a factory-style exhaust note without unnecessary complexity.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSpecific-fit exhaust muffler for select 1997-1998 Ford Expedition and 1998 Lincoln Navigator applications\u003c\/li\u003e\n\u003cli\u003eOval muffler body with aluminized steel construction\u003c\/li\u003e\n\u003cli\u003e1 inlet, 1 outlet, offset inlet and outlet configuration\u003c\/li\u003e\n\u003cli\u003e2.5-inch inlet inside diameter and 2.25-inch outlet inside diameter\u003c\/li\u003e\n\u003cli\u003eOverall length: 26 inches; body length: 22 inches; body width: 9 inches; body height: 7 inches\u003c\/li\u003e\n\u003cli\u003eWalker SoundFX Direct Fit Part Number 18921\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Overview\u003c\/h2\u003e\u003cp\u003eWalker 18921 is a direct-fit exhaust muffler engineered around the listed vehicle applications, making it a practical replacement for worn or damaged factory mufflers on the 1997-1998 Ford Expedition and 1998 Lincoln Navigator. The aluminized steel body helps resist corrosion better than low-carbon steel, while the oval shape and offset pipe connections support a straightforward exhaust layout. This part cross-references AP Exhaust 700344 for the same application.\u003c\/p\u003e\u003ch2\u003eCommon Exhaust Issues This Muffler Can Address\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eExcessive exhaust noise from a rusted or perforated muffler\u003c\/li\u003e\n\u003cli\u003eLoss of factory-style exhaust tone after muffler failure\u003c\/li\u003e\n\u003cli\u003eCorrosion-related deterioration of the original muffler body\u003c\/li\u003e\n\u003cli\u003eFitment problems caused by replacing a vehicle-specific muffler with a universal unit\u003c\/li\u003e\n\u003cli\u003eExhaust system service needs on a 1997-1998 Ford Expedition or 1998 Lincoln Navigator\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Fitment\u003c\/h2\u003e\u003cp\u003eCompatible With 1997-1998 Ford Expedition and 1998 Lincoln Navigator. Fitment is specific, so confirm inlet and outlet sizing, offset configuration, and overall dimensions before installation. Walker 18921 uses pipe connections at both ends and is not reversible or tunable.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFits 1997-1998 Ford Expedition, N\/A\u003c\/li\u003e\n\u003cli\u003eFits 1998 Lincoln Navigator, N\/A\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eWalker SoundFX Direct Fit mufflers are built with aluminized steel, mechanical interior joints, and spun-locked heads to support durable service in exhaust applications. Part Number 18921 is designed as a direct replacement muffler for the listed vehicles and follows Walker’s SoundFX product-line approach to fit and acoustics.\u003c\/p\u003e","brand":"Walker","offers":[{"title":"Default Title","offer_id":52406894821557,"sku":"BDCN-18921","price":90.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/WK_18921_Fro.jpg?v=1777775895","url":"https:\/\/www.partcatalog.com\/products\/walker-18921-exhaust-muffler","provider":"PartCatalog","version":"1.0","type":"link"}