Walker 21687 Exhaust Resonator

Walker 21687 Exhaust Resonator Overview

Walker 21687 is a direct-fit exhaust resonator built with a round steel body and aluminized finish for OE-style replacement on select GM and Pontiac applications. It uses 2.25-inch pipe connections at both the inlet and outlet to match the original exhaust layout and help maintain factory sound characteristics.

Designed for vehicles such as the Chevrolet Caprice, Buick LeSabre, and Pontiac Catalina, this resonator is tuned for proper exhaust flow and a sound profile that stays close to the original system.

Key Features

• Direct-fit exhaust resonator for select 1971-1993 applications
• 2.25-inch inlet and outlet inside diameter with pipe connection ends
• Round steel body with aluminized finish for corrosion resistance
• Center inlet and center outlet configuration
• Body dimensions: 14-inch length, 4-inch width, 4-inch height
• OE-style tuning for flow characteristics and factory-like exhaust sound

Fitment and Application Details

Compatible with a wide range of classic full-size GM vehicles, including Fits 1991-1993 Buick Roadmaster, N/A; Fits 1985-1993 Chevrolet Caprice, N/A; Fits 1991-1992 Oldsmobile Custom Cruiser, N/A; Fits 1985-1990 Buick LeSabre, N/A; Fits 1986-1990 Chevrolet Caprice, N/A; Fits 1977-1990 Oldsmobile Custom Cruiser, N/A; Fits 1987-1989 Pontiac Safari, N/A; and additional select Buick, Chevrolet, Oldsmobile, Cadillac, and Pontiac models listed in the fitment data.

This part cross-references Anchor (e.g., 2991, 3220) for the same application.

What This Resonator Helps Address

• Restores a damaged or rusted factory-style resonator section
• Replaces a worn exhaust component that can affect sound quality
• Supports proper exhaust routing on direct-fit applications
• Helps maintain OE-like exhaust tone on classic GM vehicles
• Provides a replacement option for welded exhaust assemblies when the required sections are serviced together

Installation Notes and Tips

Walker 21687 uses pipe connection inlet and outlet ends for direct-fit installation on listed vehicles. Some applications note that if the exhaust is a welded assembly, all required parts should be replaced together. Verify 2.25-inch inlet and outlet sizing, center inlet and outlet configuration, and vehicle-specific fitment before installation.

Quality Assurance

Walker designs this resonator to match original-system fit, performance, and sound characteristics using precise tuning methods and OE-style construction. The aluminized steel body is selected for durable exhaust service in the listed applications.