D&S is the only company in the U.S. rebuilding wood chipper catalytic converters — and we do it the right way, here in America, so tree crews and equipment owners aren't stuck paying full OEM for a part that can be brought back to life.
When a chipper's converter plugs up, the usual answer is a wince-inducing OEM price and a long wait. We built D&S around a better one: rebuild the converter you already own. A fresh catalyst substrate goes into your original housing, and it comes back on a core exchange in 1–2 business days for a fraction of the cost of new.
The same customers kept asking about the rest of the exhaust, so D&S now covers it: three-way catalytic mufflers for propane and gas forklifts, diesel oxidation catalysts rebuilt or new, particulate filter cleaning and replacement filters, SCR systems for generators and off-road diesels, and engine silencers and direct-fit mufflers. See all six product lines →
Every D&S converter is remanufactured right here in the United States and shipped from our Massachusetts operation. Your core never leaves the country. That means faster turnaround, work you can stand behind, and American hands on every unit.
D&S is the rebuild brand of New England Supply House in Foxboro, MA — the same team that supplies HVAC, heating, and equipment repair parts nationwide. That gives you a real company behind the rebuild: a phone number that a person answers, straight talk on fitment, and a warranty against manufacturing defects on every converter we send out.
Order a rebuild — $1,550 gas / $1,750 diesel, core exchange — or reach out with a question.
Order your rebuild ☎ 774-701-6374