We recently had beautiful Sao Paulo Yellow G80 M3 roll through the shop for some extra power along with some added sound. The customer selected a Valvetronic exhaust for his vehicle and with the push of a button on the Valvetronic controller, he can now open and close his exhaust valves remotely. In addition to the Valvetronic system, the customer decided to go with a JB4 Piggy-Back tune. The JB4 allows for a bump in power without actually flashing the ECU, a great option for those looking to explore the world of tuning – without voiding their car’s factory warranty.