Hey all, wanting to get exhaust on my 03 4.4, i dont want it obnoxious loud, just something pleasing, esp. when you tap the gas. Question, putting on exhaust system (mainly 2 mufflers) will that reduce mpg?

What exhaust or mufflers would sound the best? Borla, magnaflow, flowmaster, other? (the dinan, eisenhamn bla bla is too $$) Some ppl are saying just putting in a x pipe makes a huge sound difference?

suggestions? sound clips?