Originally Posted by Bighert3rd
Readster1, not trying to come off like a jerk but do you really think your gas mileage went up all due to a muffler swap???? Seems like every time someone installs a small bolt on their mpg goes up. Heck I should be getting 30 mpg then with the stuff I added...lol.
My MPG has not changed with the swap in of my CAI and catback