RS CZ4A 4B11 (SST/MY2009)70020 AM106 MITSUBISHI LANCER EVOLUTION 2009 4B11 Feature Although the maximum horsepower is as equal as stock intake system, torque at middle rpm range will increase and response of the engine will be quicker. The polished aluminum suction pipe will be appealed in the engine compartment. Performance Comparison Impression Stock Bad 1 2 3 4 5 Good Low mid RPM RSR Bad 1 2 3 4 5 Good Impression Stock Bad 1 2 3 4 5 Good High RPM RSR Bad 1 2 3 4 5 Good