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not sure, heh. I just started really logging mpg for the first time in years. I assume that by putting cold air in and freeing up the exhaust it helps mpg as well as performance. Could be less backpressure, though, with a larger exhaust, so not as good at low rpm? The manual tranny on the xB spins pretty high in 5th gear on the highway, so I imagine the better breathing exhaust helps!
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