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Thomas Built School Bus Exhaust Parts — HDX, C2, and EFX
Auto-jet manufactures Thomas Built school bus exhaust parts for Saf-T-Liner HDX, C2, and EFX body styles. Thomas Built is the second-most common school bus brand in North American fleets. Fitment varies significantly between body styles — confirm body style before ordering.
Thomas Built School Bus Exhaust Parts by Body Style
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Saf-T-Liner HDX: most common Thomas Built configuration. DT466, T444E, and Cummins ISB applications. Bracket location and outlet angle changed with 2007 emissions update.
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Saf-T-Liner C2: lower-floor, shorter chassis than HDX. Different routing — HDX parts do not fit C2.
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Saf-T-Liner EFX: rear-engine. Exhaust routes to rear. EFX-specific part numbers only.
Thomas Built School Bus Exhaust Parts We Stock
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Mufflers — fitment-specific by body style and engine
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Flex pipes — HDX applications: turbo outlet to muffler inlet
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Bellows — C2 engine-to-chassis flex connection
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Hangers and clamps — HDX mid-chassis mount; confirm pre/post 2007
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DPFs — Cummins ISB 2007+ applications
How to Identify the Right Thomas Built Exhaust Part
Body style (HDX, C2, or EFX), model year, and engine. The 2007 emissions update changed bracket locations and outlet angles on the HDX. HDX and C2 parts are not interchangeable.