Dynojet EFI fuel pack features a throttle position sensor based system that simplifies the process of fuel injection tuning. Mounting hardware included. The fuel pack enables you to fine tune the fuel mixture throughout the entire RPM range. No computer or software is required, simply punch in the values supplied with the fuel pak. Fuel pack is very user friendly and plugs into the existing harness on the bike. Requires use of a high performance air cleaner.