[問題] 關於馬自達323排氣管
是這樣的,半年前買了這台車 CC數1.6,來的時候頭段4-1 尾段直通,因油耗只
有6~7就把尾段換回原廠回壓管,油耗才有9~10,但是高速公路跟市區油耗居然一樣……
我在想是否要把頭段4-1換回原廠4-2-1呢?才會更省油?
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