Cummins 3912145 & 4058308 Heat Exchanger Replacement Cummins 3912145 & 4058308 Heat Exchanger Replacement Replaces Cummins part number: 3912145 & 4058308 Used on Cummins engines: 6CTA 8.3 & WET QSM 11 Heat Exchanger Specifications: Material: copper nickel Overall length: 27" / Diameter: 5-1/8"... MSRP: Was: Now: $3,460.00 Add to Cart