궁금한게 있어서 질문좀 하겠습니다~

간혹 다니는 차들보면 변속시에 바람빠지는듯한 소리가 나는 차가 있던데 무슨 튜닝이죠??

붕~~~~~~~ 피슉~ 붕~~~~ 피슉~~~ 이런소리나던데;; ㅋ

요즘은 견인차들도 다 이런 튜닝해서 다니던데 무슨튜닝인지 모르겠네요 ㅠ

알려주세요~