I just added a racepak to the duster this year and love it. Make a run, pull the sd card plug it in your laptop. I start recording right before I heat the tires. It charts my O2 readings, battery voltage, oil pressure, trans temp, carb press, g forces, rpm, and water temp. I welded fittings in both collectors so I can monitor both sides. It sure saved me a lot of time getting the jetting right.