CALL THE MANUFACTURER
School Bus Catalytic Converters and Mufflers
Auto-jet manufactures replacement mufflers and catalytic converters for every major school bus brand: Blue Bird, Thomas Built, Freightliner, IC Bus, Ford, and GM. Muffler case size and converter configuration are set by chassis and engine, so confirm the bus brand and engine before ordering.
Mufflers by Brand
Muffler assemblies built to OEM case dimensions and inlet/outlet configuration. Examples: BP400SI99 (Blue Bird, Caterpillar/Cummins), TMVPOA and TMVPBT (Thomas Built, Cummins ISB), NAV-0005 (Navistar International). Search the complete muffler listing on the parts catalog.
Catalytic Converters
Catalytic converters matched to engine and emissions configuration. Example: FORD250CONY (Ford, gas engine application). Search the complete catalytic converter listing on the parts catalog.
Frequently Asked Questions
Do mufflers fit across bus brands?
No. Muffler case size, inlet and outlet position, and mounting are set by the chassis. A Blue Bird muffler and a Thomas Built muffler for the same engine are not interchangeable.
What information do I need to order the right muffler or catalytic converter?
Bus make, model year, and engine make and model. Add the OE number if you have it.
Do you carry mufflers for older school bus models?
Yes. Auto-jet maintains coverage for school buses dating back to 1970, including models distributors have stopped stocking.