Frequently Asked Questions About Mack CX Truck DPF & Mufflers

What years and models of Mack CX trucks do these DPF systems and mufflers fit?

Our DPF systems and mufflers are designed to fit Mack CX612 and CX613 models from 2007 to 2015. These are direct replacements for trucks equipped with EPA 2007 and later emission systems. Always verify your specific engine model (typically MP7 or MP8) and check your existing DPF part number before ordering to ensure proper fitment.

How difficult is it to install a replacement DPF or muffler on my Mack CX?

Installation typically takes 2-4 hours for experienced technicians. You'll need basic hand tools, a proper lift or jack stands, and clamps rated for high-temperature exhaust applications. The most challenging part is usually removing the old unit due to corrosion on mounting hardware. We recommend having penetrating oil on hand and allowing extra time for stubborn bolts. Professional installation is advised if you're not comfortable working with exhaust systems.

What's the difference between OEM and aftermarket DPF units for my Mack CX?

OEM DPF units are manufactured to exact Mack specifications and typically last 200,000-300,000 miles with proper maintenance. Aftermarket options can save you 40-60% on cost while meeting EPA standards, though lifespan may vary between 150,000-250,000 miles depending on the manufacturer. Both require the same cleaning intervals (typically every 250,000-350,000 miles). Always verify that aftermarket units carry EPA verification numbers for legal compliance.

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

Signs your DPF needs replacement include: frequent regeneration cycles (more than once per day), check engine lights with DPF-related fault codes, excessive back pressure readings above 2.5 PSI at idle, or visible cracks in the filter housing. If your DPF has been cleaned 2-3 times already or has over 500,000 miles, replacement is often more cost-effective than another cleaning. A pressure test at your dealer can confirm if the filter substrate is damaged beyond cleaning.

Will aftermarket mufflers affect my truck's sound level or performance?

Quality aftermarket mufflers maintain factory sound levels and won't impact engine performance when properly sized. Most replacements for Mack CX trucks produce 80-85 decibels at idle, matching OEM specifications. Straight-through designs may increase sound by 3-5 decibels but can improve exhaust flow slightly. Avoid universal mufflers not specifically designed for your MP7 or MP8 engine, as incorrect sizing can cause excessive back pressure and trigger fault codes.