Kenworth T660 DPF & Mufflers

Frequently Asked Questions About Kenworth T660 DPF & Mufflers

Will this DPF or muffler fit my Kenworth T660 without modification?

Fitment depends on your truck's engine make, model year, and original exhaust configuration. Kenworth T660s were built with different engine options over their production run, so it's important to verify your engine type and chassis specs against the product listing before ordering. If you're unsure, our team can help confirm compatibility using your VIN or engine serial number.

Is this a direct OEM replacement or an aftermarket part?

Our inventory includes both OEM and quality aftermarket DPF units and mufflers. Each listing specifies whether the part is OEM or aftermarket, along with details on materials and construction. Aftermarket options are typically built to match OEM form and function, but we recommend reviewing the specific product description to understand what you're getting.

Does a replacement DPF need to be programmed or relearned by the truck's computer?

In many cases, yes. Replacing a DPF can require the engine control module to be reset or relearned so it accurately tracks soot load and regeneration cycles. This is typically done through diagnostic software at a shop or dealership. We recommend confirming with your service technician whether a relearn procedure is needed for your specific engine.

Will installing this part affect emissions compliance?

DPFs are emissions-related components, and replacing one with a non-compliant or incorrect part can affect your truck's ability to pass emissions inspections. We recommend using parts that meet EPA standards for your engine and model year. If you have questions about compliance for a specific part, reach out to our team before purchasing.

What condition are used DPFs and mufflers in, and are they cleaned or tested?

Used components in this category are inspected before listing, and condition details are noted in each product description, including any visible wear, cracks, or corrosion. For DPFs specifically, we recommend having the unit professionally cleaned and tested for soot load and backpressure before installation, even if it was inspected prior to sale.