Placing the muffler to favor one side (like the Eisenmann quad) usually makes the exhaust look lop-sided when the gases are visible in cold weather...
Like if a non-M E46 were to run a pipe from it's single muffler over to the other side, making it look like a dual exhaust. More exhaust gases would come out the left side, but only a trickle of visible gases would come out the right.
Whatever though, it still looks wicked
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