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Old 08-03-2013, 15:20   #1 (permalink)
Bryan
 
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Dual Exhaust For 2011 Crown Vic

Thinking about changing my 2011 Crown Victoria to dual exhaust. Does anyone know how much of a fuel mileage increase (if any) I'll get?
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Old 08-03-2013, 17:34   #2 (permalink)
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Re: Dual Exhaust For 2011 Crown Vic

Depends what you've got now. If your going to headers with 2 1/2" from the 2 1/4 with stock manifold, probably 1 maybe 2 gallons.
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Old 08-05-2013, 13:56   #3 (permalink)
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Re: Dual Exhaust For 2011 Crown Vic

How about if I keep the stock manifolds?
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Old 08-05-2013, 18:42   #4 (permalink)
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Re: Dual Exhaust For 2011 Crown Vic

Probably a little less, not as noticeable in mileage unless you do a lot of long hauls. The object is to drop as much resistance to the effluent gasses as possible, which will allow the engine to work less in getting rid of them.
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