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Exhaust Systems

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Reducer

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4-350 ID-ID

Reducer - Auto-jet #4-350 ID-ID

Reducer

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Reducer for school bus exhaust systems. 4" inlet, 3-1/2" outlet, Aluminized Steel.

Model

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Year Range

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Material

Aluminized Steel

Outside Diameter

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Overall Length

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OEM Part Number

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United Muffler Equivalent

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Also Known As

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Reducer, Auto-jet Part # 4-350 ID-ID

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Part Type

Reducer

Brand

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Auto-jet Part #

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Part Type

Reducer

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Auto-jet Part #

450-4 ID-OD

Part Type

Reducer

Brand

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Auto-jet Part #

5-450 OD-OD

Part Type

Reducer

Brand

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Auto-jet Part #

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Part Type

Reducer

Brand

​

Auto-jet Part #

5-450 ID-OD

Part Type

Reducer

Brand

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Provide your OEM# when ordering.

Exhaust parts vary by bus configuration even within the same model and year.

Your OEM number is the most reliable way to confirm correct fitment.

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