The Caterpillar C12 Engine Control Module CAT 2KS ECM 157-3705-02 is a performance part designed for easy installation on the front of a vehicle. This Engine Control Unit (ECU) by Caterpillar requires programming and has 70 pin terminals, making it specific to the manufacturer part number 256-1159-01. With dimensions of 14 inches in length, 2 inches in height, and 10 inches in width, this ECM is a reliable choice for those looking to enhance the performance of their car or truck.