You would have to buy the Q50 Stage1 to JB4 Upgrade Kit from BMS for $100. I would strongly recommend you also get the JB4 Bluetooth Wireless Connect Kit for $140 and the JB4 Mobile app for $28 if you go with a JB4. You don't want to drag a laptop to your car, open your hood to access the JB4 and connect a data cable to it to make any map or variable changes, review data logs or do firmware updates. Plus you can display real-time engine parameters on a gauge display on your phone. It's worth it, trust me.How would you convert this to JB4 if I bought this?