The Arlen Ness Big Shot is a simple yet effective fuel tuner that utilizes a load-based fuel injection module to correct your fuel ratio. A few of the great features of this tuner are that it does not require splicing or modifications to your Harley Davidson to install and it comes pre-loaded with base maps for the various models, which can then be fine tuned to your own individual riding style and model. Laptops and dyno machines are not required during tuning to maximize performance, which is nice as the Arlen Ness Big Shot utilizes the latest in load-based technology for fuel injection performance.