Cummins ISC/ Paccar PX8 Exhaust Manifold

• PX8/ISC Engines '08-'10
• Replaces OEM# 4937714
• Replaces OEM# 4932348

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.