Ultima Single Fire Ignition Kit - Big Dog & Titan. Do you want to increase your performance, horsepower, fuel economy, spark plug life, easy of starting and ride comfort and do it with just one easy to install part? Or, are you looking to change your throttle curves, program your rear cylinder offset and raise your rev limiter and other advanced tuning features? Well this kit does both! If you just put this in without using a computer, you will get all of the first things mentioned. You choose the level of difficulty you want; easy or advanced. What is Single fire and Dual fire? Harley...