Frequently Asked Questions About Kenworth T680 DPF & Mufflers

What model years of Kenworth T680 are these DPF systems and mufflers compatible with?

Our DPF systems and mufflers are designed to fit Kenworth T680 models from 2013 to present. However, compatibility can vary based on your specific engine configuration (Paccar MX-13, Cummins ISX15, or Cummins X15). Always verify your engine model and EPA certification year before ordering, as emissions equipment requirements changed in 2017 and again in 2021. If you're unsure, provide us with your VIN and we can confirm exact fitment.

How difficult is it to install a replacement DPF or muffler, and what tools do I need?

Installation typically takes 2-4 hours for experienced mechanics. You'll need basic hand tools, a torque wrench, and potentially a lift or jack stands. The main challenges include properly aligning the exhaust clamps and ensuring all sensors are correctly connected. Many customers report that removing the old unit is the hardest part due to corrosion. We recommend having new gaskets, clamps, and anti-seize compound on hand. Professional installation is advised if you're not comfortable working with exhaust systems.

What's the difference between OEM and aftermarket DPF systems in terms of quality and longevity?

OEM DPF systems typically last 250,000-350,000 miles with proper maintenance, while quality aftermarket units can achieve similar lifespans at 30-40% less cost. The key differences are in the substrate material and precious metal coating density. Aftermarket units from reputable manufacturers use cordierite substrates and meet all EPA requirements. Avoid extremely cheap options as they often fail emissions tests and may trigger check engine lights. Look for units that carry EPA verification numbers and come with at least a 2-year warranty.

How often should I clean or service my DPF, and what are the warning signs it needs attention?

DPF cleaning is typically needed every 200,000-250,000 miles, depending on driving conditions and idle time. Warning signs include frequent regeneration cycles (more than once per day), decreased fuel economy, loss of power, and exhaust temperatures exceeding 1,200?F during normal operation. If your dash shows a DPF warning light or you notice excessive black smoke, immediate attention is required. Regular cleaning costs $300-500 and can extend DPF life significantly compared to waiting until it's completely clogged.

Are there different muffler options available, and how do they affect sound levels and performance?

Yes, we offer three main types: OEM-style quiet mufflers (80-82 dB), moderate performance mufflers (83-86 dB), and straight-through designs (87-90 dB). OEM-style units maintain factory sound levels and won't affect your warranty. Performance mufflers can reduce exhaust backpressure by 15-20%, potentially improving fuel economy by 0.5-1 mpg. However, louder options may not be legal in all states. California, New York, and several other states have strict noise regulations. Check your local laws before selecting a louder muffler option.