Twin Tuner Ii Fuel Injection & Ignition ControllerTwin Tuner II FI tuner VRSC02 17 The most important features of these Fuel Injection controllers are: Low cost Increases horsepower Improves throttle response Eliminates spark knock Easy plug in installation and setup Very compact size only 4" (10cm) long, 2" (5cm) wide and 1 2" (1. 2cm) high Can use Dynojet Power Commander maps you have created Compatible with Twin Scan II+ Tuning Aid Also allows ignition tuning The Twin Tuner II allows you to easily