Dynojet Research Power Commander V 16-035 for Honda VTX 1800 C /  02-03 Retro Models 2002-2008 Fuel control for each individual cylinder in a smaller enclosure Warm-up fuel adjustment (unit reads engine temp and allows fuel/ timing adjustments based on the reading) Reduced size from the PCIII USB Easy to install USB powered from computer; 9 volt adapter is no longer needed