Cummins 4237 Exhaust Manifold- ISM

• ISM/M11 '94-'02

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.