but, my friend says that the moped will go much cleaner whit red sponge. I dont feel like buy a new carburator, so i'll keep the old one. and i dont wanna buy a new cylinder as well. but, is there a better way to tune my aerox? i have Pro Sport, and i want a better exhaus system, for the original cylinder. is there an option for me? or maybe Pro Sport is the best Exhaus system right now?