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Living in the city, lots of situations where I want to be quiet and exhaust-smell free.
Also I think the stock exhaust setup on our cars is great, has a well placed resonator, the rear muffler acts as an air diffuser and provides a little extra weight over the rear. And note that it'll sound louder over time as the exhaust ages, the bolts rust out etc. I've noticed that my exhaust sounds much less timid after 70k miles after it's been unbolted a couple times and aged a bit.
Like others said though if you want to clean up emissions then use E85. Some say it almost burns too clean! But also smells like a bar.
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