Peterbilt 352 DPF & Mufflers

Frequently Asked Questions About Peterbilt 352 DPF & Mufflers

Will these DPF and muffler systems fit my specific year Peterbilt 352?

Our DPF and muffler systems are designed to fit Peterbilt 352 models from 1969-1993. However, engine configuration matters more than model year. Most systems are compatible with CAT 3406, Cummins N14, and Detroit Series 60 engines. Always verify your engine model and existing exhaust pipe diameter (typically 5" or 6") before ordering. If you're unsure, contact us with your OEM and we'll confirm compatibility.

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

OEM DPF filters typically last 200,000-300,000 miles and come with manufacturer warranties, while quality aftermarket options perform similarly at 30-40% less cost. The main differences are price and warranty length. For trucks with over 500,000 miles, aftermarket DPFs often make more economic sense. Both require professional cleaning every 150,000-200,000 miles for optimal performance.

Can I install these mufflers myself, or do I need professional installation?

Muffler installation is straightforward if you have basic welding skills and proper equipment. You'll need a MIG welder, cutting tools, and exhaust hangers. The job typically takes 2-4 hours. DPF installation is more complex, requiring diagnostic software to reset ECM parameters and proper torque specifications for clamps (typically 60-80 ft-lbs). We recommend professional installation for DPF systems to maintain warranty coverage.

How do I know when my DPF needs replacement versus just cleaning?

Check for these replacement indicators: excessive back pressure (over 3.0 psi at idle), visible cracks in the filter housing, melted or damaged substrate visible through inspection ports, or if cleaning no longer restores performance after 2-3 attempts. Most DPFs can be cleaned 3-5 times before replacement. Regular cleaning extends life significantly - don't wait for warning lights.

What muffler style provides the best sound reduction without sacrificing performance?

Straight-through perforated core mufflers offer the best balance, reducing noise by 15-20 dB while maintaining minimal back pressure (under 0.5 psi). For maximum quiet operation, choose chambered mufflers with 2-3 baffles, though these add 0.5-1.0 psi back pressure. Avoid glass pack styles if noise reduction is your priority - they're louder and primarily for aesthetics. Most drivers prefer 36" or 44" lengths for optimal sound control.