RS ROADSTER NCEC LF-VE70020 AZ108 MAZDA MX 5 2006 2015 LF VE As it is designed for OBD II Close loop, increased horsepower is 2kW. However, re setting of ECU is not required. It improves response of the engine and revolution is smooth at middle and high rpm range. As a result of optimized induction, the sound will be so comfortable. Buffing finished aluminum pipe will improve looking of the engine compartment. Feature Can be used without ECU reset because of OBD II