Frequently Asked Questions About Freightliner Century 112/120 DPF & Mufflers

What model years are these DPF systems and mufflers compatible with?

Our DPF systems and mufflers are designed for Freightliner Century Class 112 and 120 models from 2007-2011, which covers the EPA-mandated DPF equipment years. These parts are specifically engineered for trucks with Caterpillar C13, C15, Detroit DD13, DD15, and Cummins ISX engines. Always verify your engine model and serial number before ordering, as some mid-year production changes may affect compatibility.

How difficult is the installation process, and what tools are required?

Installation typically takes 3-4 hours for experienced technicians and requires basic shop tools including impact wrenches, torque wrenches, and exhaust hangers. The most challenging aspect is often removing corroded factory clamps and brackets. You'll need new gaskets, clamps, and potentially new hangers depending on the condition of your existing hardware. Many customers report that having a second person helps significantly when aligning the heavy DPF unit during installation.

What's the difference between OEM and aftermarket DPF filters in terms of performance and longevity?

OEM DPF filters typically last 200,000-300,000 miles with proper maintenance, while quality aftermarket options generally achieve 150,000-250,000 miles. The main differences are in the substrate material density and precious metal coating quality. Aftermarket units often provide 70-85% of OEM performance at roughly half the cost. For trucks with over 500,000 miles or those not requiring maximum fuel efficiency, aftermarket options offer excellent value.

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

DPF cleaning is recommended every 150,000-200,000 miles or when backpressure exceeds manufacturer specifications. Warning signs include frequent regeneration cycles (more than once per day), check engine lights with codes P2002 or P244B, excessive black smoke, reduced fuel economy by 2+ MPG, and loss of power during acceleration. Regular ash cleaning can extend DPF life by 50% or more compared to running until complete failure.

Are these mufflers and DPF systems street legal in all states?

All our DPF systems and mufflers meet federal EPA requirements for 2007+ emission standards. However, California has additional CARB certification requirements that some aftermarket options may not meet. Products marked as "49-state legal" cannot be used in California for on-highway applications. Always check your state's specific requirements, especially if you operate in California, New York, or other states with strict emission enforcement.