Racing Exhaust Pipe full power for GY6 4 stroke upgrade for more power and speed 152QMI 157QMJ fit : GY6 125 150 cc pot,echapement,exhaust,mufler,pipe,echappement,racing,tuning,kymco baotian,139qmb,139qma,50,125cc,150,cc,scooter,scooters chinois,pot debrider,chicane,naraku