IC Bus School Bus Exhaust Parts: Fitment by Engine and OE Number

IC Bus school bus exhaust fitment is set by engine, not by chassis badge. The same IC Bus body has carried Navistar's DT466 and VT365, the older T444E, the emissions-era MaxxForce line, and the current IC Gas 8.8L gas and propane engine, and the exhaust and aftertreatment parts change with each one. Matching the OE number off the failed part is faster and more reliable than matching a chassis name.

Why Engine Determines IC Bus Exhaust Fitment

IC Bus has run four distinct engine platforms across the buses on the road today, and each one uses its own exhaust and aftertreatment hardware:

• DT466 and VT365: the largest group of IC Bus exhaust parts in the catalog, covering front pipes, turbo pipes, over-axle pipes, tailpipes, and hangers

• MaxxForce, 2007 and up: emissions-era diesel that requires DPF, DOC, and EGR cooler service, in addition to standard exhaust components

• T444E: an older diesel platform still common in the field, with its own tailpipe, V-clamp, and catalytic converter part numbers

• IC Gas 8.8L, 2020 and up: the current gas and propane platform, using stainless steel front pipes, over-axle pipes, and diffusers built for that engine specifically

Downstream hardware like hangers and V-clamps is shared more widely across these platforms. Front pipes, turbo pipes, and aftertreatment components are not interchangeable between them.

IC Bus Exhaust Fitment Reference

Match on OE number first. IC Bus and Navistar International share catalog numbering for many parts, so the OE number and engine are the reliable pair, more reliable than the chassis name alone.

Auto‑jet Part #	Fits	OE Number
NAVCE427	Front over-axle pipe, DT466 / VT365	3562427C1
NAVCE451	Rear over-axle pipe, right side exit, DT466 / VT365	3589451C1
NAVCE445	Tailpipe, rear over-axle, left side exit, DT466 / VT365	3589445C1
365VT58C3	Turbo pipe, VT365	3543858C3
466T2606	Turbo pipe, DT466	3582606C2
NAVCE939	Front inlet muffler pipe, DT466 / VT365	3538939C1
NAVCE916	Rear extension pipe, DT466 / VT365	3549916C1
DPFR91	DPF, MaxxForce	2594131C91
DPF836R	DPF, MaxxForce 7 / MaxxForce OR DT	2593981C91
DPF521C91	DPF, MaxxForce 13 / MaxxForce 9	2604430C91
ICEGR261	EGR cooler, MaxxForce DT	1876261C98
DOC2C91	DOC, MaxxForce, 2012 and up	26704872C91
T444TUBER	Tailpipe, T444E	Call to confirm
T444VCL7500	V-clamp, T444E	3526523C2
350400CAT	Catalytic converter, DT466 / VT365	3585872C1, 3589192C1
ICFP	Front pipe, IC Gas 8.8L	2596409C92
87890L	Diffuser, IC Gas 8.8L, stainless steel	Call to confirm
IC483SS	Over-axle pipe, IC Gas 8.8L, stainless steel	3814483C1
OVMHCE	Muffler hanger, VT365 / DT466	2507193C1, 3589192C1
DT360VCL	V-clamp, DT360 / DT466 / T444E	3553803C2, 1893794C1, and others

The full catalog includes 182 IC Bus and Navistar International parts across radiators, EGR coolers, DOCs, hangers, and fuel tanks. Search the parts catalog for the complete filtered list.

DPF-Equipped Versus Legacy IC Bus Exhaust Configurations

Whether an IC Bus needs DPF service parts depends entirely on engine, not model year of the bus body. MaxxForce engines, generally 2007 and up, require a DPF, a DOC, and an EGR cooler as part of normal exhaust service. DT466, VT365, and T444E engines predate that emissions requirement and do not use a DPF. The current IC Gas 8.8L gas and propane platform also does not use a DPF.

Confirming the engine before ordering aftertreatment parts matters more than confirming the bus model year. Two IC Bus units from the same production year can carry different engines with completely different aftertreatment requirements.

Buses on CE Series or RE Series chassis, rather than engine platform alone, are covered separately in the IC Bus fitment guide for CE Series and RE Series.

What to Confirm Before Ordering

• Read the OE number off the failed part

• Identify the engine, since front pipe, turbo pipe, and aftertreatment fitment all depend on it

• For MaxxForce engines, confirm whether the part needed is DPF, DOC, or EGR cooler, since these are not interchangeable with each other

• For tailpipes and over-axle pipes, note the exit side and discharge direction before ordering

Hanger failure and exhaust component failure travel together. The hanger replacement guide covers the inspection sequence.

Call 800-247-5391 or request a quote with the engine, year, and OE number off the failed part.

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Frequently Asked Questions

Does the same IC Bus exhaust part fit every engine?

No. IC Bus has run four distinct engine platforms, DT466, VT365, T444E, MaxxForce, and IC Gas 8.8L, and each uses different front pipes, turbo pipes, and aftertreatment hardware. Hangers and V-clamps are shared more widely, but upstream components must be confirmed by engine.

How do I know if my IC Bus needs a DPF?

MaxxForce engines, generally 2007 and up, require a DPF as part of normal aftertreatment service. DT466, VT365, and T444E diesel engines predate that requirement and do not use one. The current IC Gas 8.8L gas and propane engine does not use a DPF either.

What is the most reliable way to confirm IC Bus exhaust fitment?

Match the OE number stamped on the failed part, then confirm the engine. Chassis name alone is not enough, since the same IC Bus body has carried multiple different engines across its production years.