For the first time this fall, the weather was cool enough today that the exhaust fumes of most cars on the road were visible. Waiting in traffic, I noticed something very odd with the Mazda 6 in front of me- only one of the exhaust tips was blowing out water vapour. What's up with that? Curious, I then started keeping an eye out for it- a Mazdaspeed 6 did not have this happening... a Saturn Aura did not have this happening... a Ford Fusion V6 did have this happening. I even made it a point to check out the twin pipes on the Altima I drive, a 4 banger, and saw that both pipes had visible vapour.
So what's up with that? Are some vehicles with dual pipes actually just doing it more for show than anything else? If there's no visible vapour, does that mean that the one pipe doesn't have exhaust fumes going through it?
Inquiring minds want to know.
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