Valvetronic Design Mercedes CLA45 Valved Sport Exhaust SystemWelcome to the Valvetronic solution for the baby AMG. From factory, these cars come standard with a lot of pops and bangs in the exhaust, but the overall exhaust tone is numb. It may be exciting when you shift, but on throttle sound relates more to a vacuum than a traditional AMG car. Our full exhaust system changes the overall tone of this engine by increasing the exhaust diameter to 3 inches from the downpipe back to give a much more aggressive and