Exhaust manifold illustration – not the actual part
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Exhaust manifold illustration – not the actual partDiesel Parts Direct logo

Aftermarket parts may appear slightly different, including the packaging.

CumminsISB / QSBExhaust Manifolds

Cummins 3937478 Exhaust Manifold For ISB Diesel Engines

Genuine Cummins Part

OEM #: 3937478SKU: 3937478

Ships in 4-5 days

$413.44

Taxes and Shipping are calculated at checkout

Special Order Item - not eligible for return

SKU 3937478
OEM Number 3937478
Part Type Exhaust Manifolds
OEM Brand CUMMINS

Aftermarket warranty

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Genuine Cummins parts warranty

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Call any of our friendly Parts Dept. Specialists with your engine serial number, and we can quickly verify whether this part is the correct part for your engine — no guesswork.

Phone: 888.687.0539

Don't know how to find your engine serial number? Go to our Engine Help Center for assistance.