FITMENT
- 2002-2007 Cummins Volvo, Peterbilt, Mack, International, Freightliner, Kenworth with the ISX CM870 Engines.
DESCRIPTION
Product Overview
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As an early 15L platform equipped to meet emissions standards, the 2002–2007 Cummins ISX CM870 relies on EGR hardware that is notoriously prone to long-term mechanical failure. Over time, internal carbon fouling causes the EGR valve to stick open, while thermal cycling degrades the EGR cooler—leading to severe intake restrictions and dangerous coolant loss directly into the exhaust stream or intake charge.
- Purpose-built for high-performance and off-road applications, this Stage 2 EGR Plug Kit goes beyond simple block-off plates to deliver a comprehensive sealing strategy. By precision-capping all corresponding exhaust, intake, and coolant crossover ports following component removal, it permanently isolates your ISX engine from internal coolant leaks, seals off high-pressure exhaust gas leaks, and ensures absolute manifold integrity.
Key Features
- Seal the EGR valve port, exhaust crossover passages, and coolant circuit openings with a complete set of billet aluminum block-off plates and 304 stainless steel plug fittings.
- Prevent exhaust gas from seeping back into the intake tract through abandoned EGR ports — the root cause of soot fouling in deleted CM870 builds.
- Eliminate coolant leakage risk at the former EGR cooler connection points with properly sized, high-pressure-rated sealing plugs.
- Achieve a warp-resistant seal even under sustained heavy-load manifold temperatures, thanks to billet construction and graphite gaskets rated for high-heat duty cycles.
- Rely on CNC precision machining for a bolt-on fit at every sealing surface — no grinding, filing, or improvisation required.
FAQ
Q: What exactly does this Stage 2 kit seal that a basic block-off plate doesn’t?
A: A basic Stage 1 solution typically blocks only the main EGR valve mounting port. This Stage 2 kit includes additional plates and plugs for the exhaust crossover tube connection, coolant feed and return passages, and secondary EGR circuit openings. It’s the difference between plugging one hole and sealing the entire system.
Q: Are CM870 and CM871 EGR kits interchangeable?
A: No — and mixing them up will leave you with components that don’t fit. The CM870 and CM871 engines were designed with fundamentally different EGR system layouts and port configurations. Double-check your engine data plate and confirm CM870 before ordering.
Q: Can the graphite gaskets hold up under sustained highway EGTs?
A: Yes. The gaskets are specifically selected for high-temperature graphite construction that maintains its sealing integrity well above the normal sustained EGT range of a working ISX. They won’t burn out, delaminate, or cold-flow under bolt compression the way standard fiber gaskets do.
Q: Does installing this kit reduce intake soot accumulation?
A: By sealing off every exhaust recirculation pathway, the kit prevents combustion byproducts from re-entering the intake side. The result is cleaner intake runners, less abrasive particulate passing through the turbo inlet, and a noticeable reduction in the carbon deposits that choke airflow and drive up maintenance costs over the long haul.
