All of the Hondas on the road today have one version, or another, of an onboard diagnostic computer. The computers in cars help control rev limits, idle limits, ignition and fuel timing, and react to data that is sent from a vehicle's sensors. If a car has engine modifications done to it that don't sync up with the computer, it will never run correctly and will likely have problems that reveal themselves through check engine lights and mechanical trouble. There are two options when it comes to performance oriented vehicle computers, which are stand alone replacement computers and "piggy back" chips that modify certain settings in the factory computer. Of these two options, the tuned chips are the most economical because of the price and the versatility. Stand alone replacement computers are extremely effective, but the downsides are the thousands of dollars that they cost and the level of difficulty involved with the tuning. The entry level chip tuning options may require a small control box that is wired into the vehicle and offers on and off options, as well as a few other adjustments. The more effective and costly chip tuning options involve the customer removing the factory computer and sending it into a company who specializes in reprogramming new performance enhancing software onto the computer. The customer can then install the computer and drive immediately.