Exhaust Kit for Ford F-250 (1987-1996) 4.9L 5.8L 7.5L

High-Flow Dual Muffler-Back Exhaust Kit for 1987-1996 Ford F-250 (OBS)

What it Does: The Flowsound Dual Muffler-Back Exhaust Kit replaces the restrictive factory single-exit exhaust on the 1987-1996 Ford F-250 to lower exhaust backpressure, reduce thermal retention, and optimize exhaust gas velocity.

The Stock Ford F-250 Exhaust Restriction

The factory exhaust on the OBS (8th and 9th generation) Ford F-250 utilizes crimped, crush-bent tubing paired with a densely baffled, single-exit silencer. This configuration generates significant backpressure under load, compounding thermal buildup behind the manifold and stifling exhaust scavenging on Ford 300 Inline-6, Windsor 351W, and 385-Series 460 powertrains. Over decades of operation, road salt and condensation also rot out the light-gauge factory carbon steel joints.

The Engineering Solution

Engineered for high-volume scavenging, this kit features smooth, mandrel-bent 2.5-inch aluminized steel tailpipes that maintain consistent cross-sectional diameter through every radius. Paired with a chambered Flowsound muffler utilizing a high-flow 3.0-inch single inlet and dual 2.5-inch outlets, the system balances acoustic resonance while promoting laminar flow. The dual tailpipes exit straight back under the rear bumper parallel to the frame rails, cleanly clearing factory receiver hitches and full-size OEM spare tire mounts across all standard wheelbase layouts.

What's Included

• 1 Flowsound 2-chamber muffler (single 3" inlet, dual 2.5" outlets)
• 2 Aluminized mandrel-bent two-piece 2.5" tail pipes (slip-together design)
• 8 Muffler clamps
• 1 Larger exhaust clamp
• 4 Rubber-insulated hangers

Technical Specifications

Compatibility

• 1987-1996 Ford F-250 4.9L Inline-6 (Gasoline, factory single-inlet muffler only)
• 1987-1996 Ford F-250 5.8L V8 (Gasoline, factory single-inlet muffler only)
• 1987-1996 Ford F-250 7.5L V8 (Gasoline, factory single-inlet muffler only)

Frequently Asked Questions & Fitment Warnings

Does this fit the OBS F-250?

Yes, this is a fit for the 1987-1996 Ford F-250 equipped with the 4.9L, 5.8L, or 7.5L gasoline engines with single-inlet factory mufflers. It does not fit diesel models (6.9L/7.3L IDI or Power Stroke), dual-inlet factory exhaust layouts, or trucks with aftermarket relocated fuel tanks.

Is this exhaust kit a direct bolt-on installation?

No, this is not a direct bolt-on system; professional installation is recommended as intermediate tube fabrication may be required depending on cab configuration, wheelbase length, and aftermarket suspension clearance.

The Ford Heavy-Duty Standard

Built to handle severe-duty commercial hauling and off-road trail vibrations, this exhaust setup replaces brittle factory tubing with corrosion-resistant aluminized steel engineered to handle sustained heavy towing loads without failing.