The Akrapovic RACING OPEN complete system is designed for maxi scooter riders looking for a sportier ride and a bit of the kind of tuning usually reserved for sport motorcycles. With an Akrapovic exhaust system the Yamaha T-max will gain in both looks and performance. The system has a noise damper for European market and is available without the damper for the US market. Our system is also 5.11 kg lighter than stock system.      Performance   Measurements of the Akrapovic RACING OPEN system on the YAMAHA T-MAX (without noise damper):  Power & Torque: with the Akrapovic complete system the engine gains significant increases in power and torque. The T-max engine will now have more throttle response throughout the entire rpm range with biggest increase at the top. We measured max. power increase of 2.9 HP at 7620 rpm.