Cummins 5999 Exhaust Manifold - 2250/2350/X15

• Replaces OEM# 3687032
• Cummins Engines '11-'23

Increases fuel Mileage by .2-.3 MPG, has ceramic coating to reduce heat absorption and improves air velocity, lowers EGT's 80-100 F and manifold temps 300 F, less turbo lag and offers a 3 year warranty on any cracks or warping.