I have an 06 Grand Marquis GS. V8 flexfuel engine. Will putting a dual exhaust system improve gas mileage?

Asked by Nov 24, 2015 at 01:10 AM about the 2006 Mercury Grand Marquis GS

Question type: Car Customization

2 Answers

69,785

Maybe a small amount and you will pick up a few HP as well. I would expect no more than 1 mpg if that.

2 of 2 people found this helpful.

The cost of it is no way no how worth it

5 of 5 people found this helpful.

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