Exhaust Kit for Ford F-250 (1998-1999) 5.4L

High-Flow Dual Muffler-Back Exhaust Kit for 1998-1999 Ford F-250 (PN96)

What it Does: The dual muffler-back exhaust kit replaces the restrictive factory single tailpipe and baffled silencer on the 1998-1999 Ford F-250 to lower backpressure, accelerate exhaust velocity, and improve engine scavenging under load.

The Stock Ford F-250 Exhaust Restriction

From the factory, the 1998-1999 Ford F-250 equipped with the 5.4L Triton (Modular 2V) V8 routes exhaust through a single-inlet, highly baffled OEM chambered muffler paired with narrow, crush-bent tubing. Crush-bent pipe geometry creates localized neck-downs, increasing parasitic pumping losses and trapping thermal energy near the rear axle. Under sustained towing or heavy hauling, this excessive backpressure restricts cylinder scavenging, increases combustion chamber temperatures, and stifles throttle response on the PN96 platform.

The Engineering Solution

This dual muffler-back system resolves factory flow bottlenecks by routing spent gases through a free-flowing Flowsound 2-chamber muffler utilizing a 3.0-inch inlet and dual 2.5-inch outlets. The tailpipes are manufactured from heavy-duty 2.5-inch aluminized steel and shaped using CNC mandrel bending, which preserves consistent internal pipe diameter across every radius without wall collapse. Designed with a dual rear-exit path parallel to the frame rails, the geometry maintains critical clearance around OEM spare tires and factory receiver hitches across all wheelbase configurations.

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)
• 8 muffler clamps
• 1 larger exhaust clamp
• 4 rubber-insulated hangers

Technical Specifications

Compatibility

• 1998-1999 Ford F-250 Base 5.4L V8 Gas (Factory Single-Inlet Muffler Only)
• 1998-1999 Ford F-250 XL 5.4L V8 Gas (Factory Single-Inlet Muffler Only)
• 1998-1999 Ford F-250 XLT 5.4L V8 Gas (Factory Single-Inlet Muffler Only)
• 1998-1999 Ford F-250 Lariat 5.4L V8 Gas (Factory Single-Inlet Muffler Only)

Frequently Asked Questions & Fitment Warnings

Does this fit the PN96 F-250?

Yes, this fits the 1998-1999 Ford F-250 equipped with the 5.4L Triton engine. Does not fit models equipped with CNG, LPG, or bi-fuel systems, or trucks with dual-inlet factory mufflers.

Is this exhaust system a direct bolt-on installation?

No, this is not a direct bolt-on kit; an experienced installer may need to cut or fabricate adapter pipe sections ahead of the muffler, and aftermarket suspension, wheel, or tire configurations can alter clearance.

The Ford Truck Standard

Engineered to handle severe towing cycles and off-camber frame flex, this aluminized steel dual exhaust configuration ensures reliable thermal evacuation and rigid structural mounting under extreme commercial duty.