Walker 40259 Exhaust Y Pipe

Walker 40259 Exhaust Y Pipe for GM Trucks

Walker 40259 is a specific-fit exhaust Y pipe built for select Chevrolet and GMC truck applications from the late 1970s through the mid-1980s. It uses aluminized steel construction and precision-formed bends to support a direct-fit exhaust repair on compatible Chevrolet C10, C20, C30, C10 Suburban, GMC C2500, C3500, P2500, P3500, P20, and P30 models.

Key Features

• Aluminized steel construction for corrosion resistance and durability
• Specific-fit design for direct replacement on listed applications
• 2 inlet, 1 outlet Y pipe layout for exhaust routing
• 3-bolt loose flange with spherical flare inlet connection
• 2.5-inch outlet outside diameter
• 24.5-inch overall length
• 0.05-inch pipe wall thickness
• Compression bend type for formed exhaust routing

Product Details

Walker 40259 is an exhaust Y pipe engineered for vehicles that use a dual-inlet to single-outlet exhaust transition. The aluminized steel finish helps the pipe stand up to everyday exhaust heat and road exposure, while the precision-bent construction supports accurate alignment during replacement. This part number, 40259, is a direct-fit option for select Chevrolet and GMC applications where the original exhaust routing matches the listed configuration.

This part cross-references Dorman - HELP 93928 for the same application.

Vehicle Fitment

• Fits 1982-1984 Chevrolet P20, N/A. Do Not Use with Federal Emission Control or H5D Emissions.
• Fits 1982-1984 Chevrolet P30, N/A. Do Not Use with Federal Emission Control or H5D Emissions; Dual Outlet Muffler.
• Fits 1982-1984 GMC P2500, N/A. Do Not Use with Federal Emission Control or H5D Emissions.
• Fits 1982-1984 GMC P3500, N/A. Do Not Use with Federal Emission Control or H5D Emissions; Dual Outlet Muffler.
• Fits 1980-1982 Chevrolet C20, N/A. Do Not Use with Federal Emission Control or H5D Emissions; Heavy Duty; without Catalytic Converter.
• Fits 1980-1982 Chevrolet C30, N/A. Do Not Use with Federal Emission Control or H5D Emissions; with Single Exhaust.
• Fits 1980-1982 GMC C2500, N/A. Do Not Use with Federal Emission Control or H5D Emissions; Heavy Duty; without Catalytic Converter.
• Fits 1980-1982 GMC C3500, N/A. Do Not Use with Federal Emission Control or H5D Emissions; with Single Exhaust.
• Fits 1979-1981 Chevrolet P30, N/A.
• Fits 1979-1981 GMC P3500, N/A.
• Fits 1979 Chevrolet C20, N/A.
• Fits 1979 Chevrolet C30, N/A.
• Fits 1979 GMC C2500, N/A.
• Fits 1979 GMC C3500, N/A.
• Fits 1979 GMC P2500, N/A.
• Fits 1976-1978 Chevrolet C10, N/A. Fits Models without Manifold Gasket; without Catalytic Converter.
• Fits 1976-1978 Chevrolet C10 Suburban, N/A. Fits Models without Manifold Gasket; without Catalytic Converter.

Installation Notes

Verify the inlet flange style, outlet diameter, and exhaust routing before installation. This Walker exhaust Y pipe is a specific-fit part, so matching the vehicle configuration and emissions setup is important for proper alignment. Confirm that the application does not use Federal Emission Control or H5D emissions where noted, and check for the listed dual outlet muffler, single exhaust, heavy-duty, or no catalytic converter requirements before ordering.

Quality Assurance

Walker manufactures this pipe with precision benders and fixture checking to support consistent fitment and installation accuracy. The aluminized steel construction and controlled forming process are used to help deliver a replacement exhaust component that matches the intended vehicle application.