The 5speed the fan and the muffler probably made the most difference. It seems to rev a lot faster without that crappy lopsided fan hanging off the front and its way smoother at idle I've been at stop lights before and almost couldn't tell it was running and i can tell its a lot nicer to my water pump. I got about 20 more miles to the tank on the last three tanks with the five speed and fan combo the cold air intake is nice in the winter but about the same in the summer but i only paid like 10 for the adapter on ebay so pretty fair gain for the money. The headers give it some torque only really noticeable when i tow though those were mostly for exhaust sound but i can say all together i was averaging about 300 miles a tank before now i usually break about 320 0r 330 per tank. Nothing major but i could probably getter better mileage if i went to the regular 3liter injectors mine are bigger and spray more due to the flex fuel but i can't run ethanol since i tuned out the auto tranny.
New DD-2009 Ford Mustang GT/CS candy apple red.
(sold)2003 XLT Tan 3.0L V6 5-speed, Lots of mods.
Last edited by pearlkid9988; 12-01-2013 at 11:33 PM.