Frequently Asked Questions About Freightliner FLT Cabover DPF & Mufflers

Will these DPF and muffler systems fit my specific Freightliner FLT model year?

Our DPF and muffler systems are designed specifically for Freightliner FLT Cabover models from 2007-2016. The most common fitments are for the FLT86, FLT112, and FLT120 models. Due to EPA regulations, DPF systems became mandatory starting in 2007. Always verify your engine model (typically Detroit DD13 or DD15) when ordering, as mounting brackets and pipe diameters can vary between engine configurations.

What are the main differences between OEM and aftermarket DPF systems for my FLT?

Aftermarket DPF systems typically offer 30-40% cost savings compared to OEM units while meeting all EPA standards. The main differences include: aftermarket units often use 409 stainless steel versus 304 stainless in some OEM models, aftermarket systems may have slightly different sensor port locations (though all required ports are included), and warranty periods vary from 1-2 years for aftermarket versus 2-3 years for OEM. Performance-wise, quality aftermarket units provide identical filtration efficiency and backpressure specifications.

How difficult is the installation process, and what tools will I need?

Installation typically takes 3-5 hours for experienced technicians. You'll need: a full socket set including deep wells, band clamp tools, new gaskets (usually included), anti-seize compound for sensor threads, and ideally a lift or pit access. The most challenging aspects are usually accessing the upper mounting brackets and properly aligning the inlet/outlet pipes. Many customers report needing to slightly adjust existing exhaust hangers for perfect fitment. Professional installation is recommended if you're not comfortable working with exhaust systems.

How often should I clean or service my DPF, and what are the warning signs of a clogged filter?

DPF cleaning intervals vary based on driving conditions but typically range from 150,000-250,000 miles. Warning signs include: frequent regeneration cycles, reduced fuel economy (10% or more drop), excessive black smoke during acceleration, engine derating or reduced power, and check engine lights related to exhaust backpressure. Regular highway driving helps passive regeneration, while stop-and-go operations may require more frequent manual or forced regenerations.

What's included in a complete DPF and muffler kit, and are there any additional parts I should order?

Complete kits typically include: the DPF unit with integrated DOC (Diesel Oxidation Catalyst), muffler assembly, mounting brackets and hardware, inlet/outlet pipes, and basic gaskets. However, you should also consider ordering: temperature and pressure sensors (if not transferring from old unit), additional exhaust clamps, flex pipe sections if yours show wear, and heat shields if damaged. Some installations may require adapter pipes if retrofitting newer style systems to older trucks.