i have a 2001 f150 4.6 4x4 i want new exhaust i want two pipes out the back and not real loud but i do want it to make so noise were should i get it should i buy online and if so were or go to a shop please help anything that help get me better than 14 mpg would be good how much should it cost

 

unless your gunna install it urself, i would go with a muffler shop......its about the same price as online and none of the work for you