Bandit Intimidator 21XP Diesel Catalytic Converter Rebuild
New England Supply House is the only company in the U.S. rebuilding wood chipper catalytic converters.
The Bandit Intimidator 21XP is the largest hand-fed drum chipper in the Bandit lineup, built for the most demanding tree removal and land clearing operations. It runs a Caterpillar C7.1 Tier 4 Final diesel with a full DOC + DPF aftertreatment system. High-production duty stresses the aftertreatment system hard. New England Supply House rebuilds degraded units through our core-exchange program.
Engine & Exhaust System
| Engine | Caterpillar C7.1 Tier 4 Final Diesel |
|---|---|
| Catalyst Type | Diesel oxidation catalyst (DOC) + diesel particulate filter (DPF) |
Why Catalytic Converters Fail on This Machine
The Cat C7.1 runs a more capable aftertreatment stack than smaller Tier 4 engines, but it faces the same fundamental challenge in chipping service. Intermittent high-load operation followed by shutdown prevents the DPF from completing passive regen cycles. Plugged filters force active regen at the worst times — often when the machine is sitting between jobs — and repeated thermal cycling cracks the substrate. Left unaddressed, a degraded DOC/DPF reduces engine efficiency and triggers derate events that take the machine out of service.
What’s Included in the Rebuild
- Full disassembly and inspection of the catalyst housing and substrate
- New catalyst substrate installed to OEM specifications
- Reassembly using your existing housing (core exchange — your housing returns to you)
- Performance verification before return shipping
- Warranty against manufacturing defects
How Core Exchange Works
Core exchange is required — we rebuild your catalytic converter, so we need your core to complete the job.
- Place your order. Order the converter rebuild you need — gas or diesel — at newenglandsupplyhouse.com.
- Get your converter to us. Choose drop-off or shipping at checkout and we’ll send instructions — drop-off is by appointment at our Foxboro shop, or ship it to us from anywhere in the country. We rebuild your unit with new internals.
- Back to work in 1–2 days (typically). Standard turnaround is 1–2 business days. Need it sooner? Ask about our 24-hour rush rebuild.
Order your rebuild
Your Bandit Intimidator 21XP uses the diesel rebuild. Checkout takes a minute, then we email shipping or drop-off instructions for your core. Rebuilt and on its way back in 1–2 business days, typically.
Order the diesel rebuild · $1,750
Questions first? Call 774-701-6374.