Exhaust Manifold Kit For Cummins 5.9L 6B ISB QSB B5.9 – Cast Iron 3943872

Hey Cummins guys!

If you've got a 5.9L 6B, ISB, QSB, or B5.9 engine and the exhaust manifold is cracked or leaking, this kit has you covered.

It's an ASI Performance cast iron exhaust manifold kit.

It includes the manifold, and it matches OEM numbers like 3943872, 3942225, 3943871, 3943875, 3942259, and 3943874.

It's the correct black cast iron piece, ready to bolt on.

These manifolds can take a beating, and a fresh one will get your turbo spooling right and keep exhaust where it belongs.

Comes with a 1-year warranty.

A solid, heavy-duty replacement for a hard-working engine.