Freightliner School Bus Exhaust Parts: Fitment Guide for FS65 and FC2

Freightliner school bus exhaust parts require chassis-specific fitment - not just engine confirmation. The FS65 and FC2 are different chassis with different exhaust routing, and the FS65 ran multiple engine options that affect component specs.

See Also: Blue Bird School Bus Exhaust Parts: Fitment by Body Style and Engine

See Also: Blue Bird School Bus Exhaust Hangers and Clamps: Inspection and Replacement

Why Freightliner School Bus Exhaust Parts Require Chassis Confirmation First

The FS65 and FC2 are two fundamentally different buses. Ordering Freightliner school bus exhaust parts without specifying chassis type is the most common Freightliner fitment error.

• FS65: Type C, front-engine, conventional hood - the most common Freightliner school bus chassis in active fleet service

• FC2: Type D, rear-engine, flat-nose - different exhaust routing and component specs throughout

Freightliner FS65 Engine Options and What They Change

The FS65 ran three engine options across production years in overlapping model years. Engine determines muffler fitment - pull the engine tag before ordering.

• Mercedes MBE900: most common FS65 engine in fleet service - specific inlet diameter and muffler position

• CAT 3126: requires different muffler specs from the Mercedes - not interchangeable

• Cummins ISB: less common on FS65 - confirm engine tag before ordering

Freightliner FS65 Exhaust Parts

• Muffler: part 11-0025 for Freightliner FS65 1998 and up - confirm engine before ordering

• Flex pipe/bellows: FRLBELL covers standard FS65 bellows position - measure OD and overall length before ordering

• Tailpipe: FRLTP02 FRONT fits the FS65 front-exit configuration

• Hanger/mount: FRLMHRUB rubber hanger isolator for FS65 muffler mounting

What to Confirm Before Ordering Freightliner FS65 Exhaust Parts

• Chassis type: FS65 or FC2 (chassis data plate)

• Engine make and model (engine tag - not chassis year alone)

• Model year

• Component being replaced: muffler, flex pipe, hanger, tailpipe, or clamp

• Inlet and outlet diameter - measure if the original is still installed

Auto-jet manufactures exhaust components for Freightliner FS65 and FC2 school buses.

Call 800-247-5391 or request a quote with chassis type, engine, and year to confirm fitment.

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Frequently Asked Questions

Does a Freightliner FS65 take the same exhaust as an FC2?

No. The FS65 is a Type C front-engine chassis and the FC2 is a Type D rear-engine chassis. Exhaust routing, muffler position, and component specifications are different between the two. Confirm chassis type before ordering any exhaust component.

What engines did Freightliner use in school buses?

The FS65 ran Mercedes MBE900, CAT 3126, and Cummins ISB depending on year and configuration. Engine choice affects muffler fitment, flex pipe dimensions, and tailpipe routing. Always confirm engine make and model from the engine tag, not just the chassis year.