Stage 1 tuning file for Caterpillar C4.4 ACERT engine (Tier 4 Interim, 2013) running ADEM 4 ECU with firmware 4176020-00 / 5163302-00. This full binary provides enhanced torque and throttle response while retaining emission system compatibility. Ideal for off-highway machines such as skid steers, telehandlers, small excavators and wheel loaders.