I have a 2004 Dodge Dakota Quadcab. It has the 4.7L V8 with 5 speed manual trans. What Flowmaster should I put on it to get the best gas mileage and to not lose any mpg. I'm also thinking of putting a K&N cold air intake on it, but I for sure don't want to lose any mpg. I already have a K&N air filter on it. Would any of this hurt the gas mileage? I get about 19-21 mpg now.
It has the stock exhaust on it now
It has the stock exhaust on it now