新車跑400邁高速發現後門處積了些黑色的汙垢，正常不？謝！

所有跟帖： 

• 後門 or tailpipe? if latter it's abnormal -internuts- ♂ (0 bytes) () 09/16/2009 postreply 14:26:44

• why abnormal? 我的車尾氣口一直黑區區的，地雷說正常。 -1800800- ♂ (100 bytes) () 09/16/2009 postreply 16:37:40

• for a 4000mile new car, tailpipe should be clean relatively -internuts- ♂ (210 bytes) () 09/16/2009 postreply 17:03:35

• question for （3）為何廠家要這樣做? 是設計有問題還是想榨出more hp -1800800- ♂ (0 bytes) () 09/16/2009 postreply 19:19:28

• program not optimized -internuts- ♂ (409 bytes) () 09/17/2009 postreply 08:40:40

• 3ks -1800800- ♂ (0 bytes) () 09/17/2009 postreply 16:22:18

• 是後門不是 tailpipe，有人說是air-dynamic，謝大家的回複！ -mlx- ♀ (0 bytes) () 09/17/2009 postreply 10:56:32

• 這也問? -internuts- ♂ (0 bytes) () 09/17/2009 postreply 18:37:28