Frequently Asked Questions About Peterbilt 567/579 DPF & Mufflers

Will these DPF and muffler systems fit my specific Peterbilt 567 or 579 model year?

Most aftermarket DPF and muffler systems for Peterbilt 567/579 models are designed to fit trucks from 2013 onwards, when these models were introduced. However, there can be variations based on your engine type (Paccar MX-13, Cummins ISX15, etc.) and exhaust configuration. Always verify compatibility by checking your truck's VIN, engine model, and existing exhaust setup. Key differences exist between pre-2018 and post-2018 models due to emission standard updates.

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

OEM DPF systems typically last 200,000-400,000 miles with proper maintenance, while quality aftermarket options can achieve similar lifespans at 30-40% less cost. Look for aftermarket DPFs with cordierite or silicon carbide substrates and proper EPA certification. The main differences are in warranty coverage (OEM usually offers 2-3 years vs. 1-2 years for aftermarket) and the precision of fit, with OEM parts requiring minimal adjustment during installation.

How difficult is it to install a replacement DPF or muffler, and what tools are required?

Installation typically takes 3-5 hours for experienced technicians and requires specialized tools including a DPF gasket kit, torque wrench (80-100 ft-lbs for most connections), exhaust hangers, and potentially a lift or jack stands. The most challenging aspects are aligning the heavy DPF unit (40-60 lbs) and ensuring proper sensor connections. Many drivers opt for professional installation to avoid sensor calibration issues and ensure warranty validity.

What are the signs that my DPF needs replacement versus just cleaning?

Replace your DPF when you experience frequent regeneration cycles (more than once per 300 miles), consistent backpressure readings above 2.5 PSI at idle, or visible cracks in the filter housing. Cleaning is sufficient for ash buildup under 80% capacity and when regenerations still complete successfully. A damaged substrate, melted areas from excessive heat, or contamination from engine oil or coolant always require replacement rather than cleaning.

Which muffler style provides the best balance of sound reduction and performance?

Straight-through performance mufflers offer 15-20% better exhaust flow while maintaining acceptable noise levels (80-85 dB). For maximum quiet operation, choose chambered or turbo-style mufflers that reduce sound to 75-80 dB but may slightly increase backpressure. Stainless steel construction (409 or 304 grade) provides 5-7 years of corrosion resistance compared to 2-3 years for aluminized steel options. Consider your typical routes - urban drivers often prefer quieter options to meet local noise ordinances.