Frequently Asked Questions About Ford LTA / LTL 9000 Truck DPF & Mufflers

Will these DPF and muffler systems fit my specific Ford LTA or LTL 9000 model year?

Our DPF and muffler systems are designed to fit Ford LTA and LTL 9000 trucks from model years 1988-1998. However, there can be variations based on engine type (Caterpillar, Cummins, or Detroit Diesel) and whether your truck has extended frame rails or custom exhaust routing. We recommend checking your current exhaust pipe diameter and DPF mounting bracket style before ordering. Most systems fit 5-inch exhaust pipes, but some earlier models may have 4-inch systems.

What's the difference between OEM and aftermarket DPF filters, and which should I choose?

OEM DPF filters typically last 100,000-150,000 miles and come with manufacturer warranties, while quality aftermarket options can provide similar performance at 30-40% less cost. The main differences are in the substrate material and cell density. OEM filters use cordierite or silicon carbide with 200-300 cells per square inch, while aftermarket options may vary. For trucks with over 500,000 miles or frequent stop-and-go driving, OEM is recommended. For highway applications with regular maintenance, aftermarket DPFs can be a cost-effective choice.

How difficult is the installation, and what tools will I need?

Installation typically takes 3-5 hours for experienced mechanics and requires basic hand tools plus some specialized equipment. You'll need: exhaust clamps (usually 5-inch), a sawzall or exhaust pipe cutter, jack stands rated for commercial trucks, penetrating oil for rusty bolts, and a torque wrench for DPF mounting brackets (torque to 45-50 ft-lbs). The most challenging part is usually removing the old system due to rust and corrosion. Many customers report needing to cut the old exhaust pipes rather than unbolting them.

What muffler styles are available, and how do they affect sound levels?

We offer three main styles for Ford LTA/LTL 9000 trucks: straight-through (loudest, best flow), chambered (moderate sound reduction, good performance), and turbo-style (quietest, slight flow restriction). Straight-through mufflers produce 88-92 dB at idle, chambered designs reduce sound to 82-86 dB, and turbo-style mufflers bring levels down to 78-82 dB. Most states require commercial trucks to stay under 90 dB. Chrome and aluminized steel finishes are available, with chrome lasting longer but costing 40-60% more.

How often should I clean or replace my DPF, and what are the warning signs of failure?

DPF cleaning is recommended every 150,000-200,000 miles or annually for high-idle applications. Warning signs include: excessive black smoke, engine derating or power loss, check engine lights (codes P2002, P2003), and regeneration cycles occurring more than once per tank of fuel. Cleaning costs $300-500, while replacement runs $1,200-2,500. To extend DPF life, use only ultra-low sulfur diesel, maintain proper engine timing, and avoid excessive idling. If your exhaust temperature gauge consistently reads above 1,200 degrees Fahrenheit during normal driving, have your DPF inspected immediately.