Steed Speed Upgraded Replacement Exhaust Manifold For 4BT 3.9L Cummins powersports followed by a short pause

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126 compliant

This kit is hands down the strongest option for any GM Heavy Duty Truck

0L Powerstroke With 5R110 Transmission

Steed Speed Upgraded Replacement Exhaust Manifold For 4BT 3.9L Cummins powersports followed by a short pauseSteed Speed Upgraded Replacement Exhaust Manifold For 4BT 3. 9L Cummins Steed Speed Manifolds are CNC Machined from 1018 Mild Steel Billet and finished with a satin black coating of Techline, these aren't your typical cheap cast or tubular manifolds. Steed Speed engineers some of the finest manifolds on the planet. The Techline coating is capable of handling up to 1700 degrees continuously and up to 2000 degrees for short periods. Steed Speed