Originally Posted by barry2345
I have increased my mileage by 4-6 miles per gallon, I installed a K&N cold air intake, E3 spark plugs, and I added a 3.5 inch rear most muffler removing the center muffler. This also gave me a horsepower increase of about 12-15.
I'm not trying to be a wise ass or anything but I have to questions these claims...
First, how did you quantify the HP gains? I have a tough time believing a 12-15 gain.
Even more unlikely is the 4-6mpg increase.
Let's face it, if these kinds of gains were real why would Ford NOT do them as the cost would be near zero and they'd bitch slap the competition big time.
So, how did you verify these gains?