my truck is the 5.4 with 186k miles,my question is keeping the stock cats and removing the stock muffler will i see a low end power loss/gain? or because milage should i just keep it all stock? anvice/input???? thanks ya'll

 

984x4-5.4,Install high flow cats and a good performance muffler of your choice.With the miles on your truck I'm sure you would see the difference w/ the cats and mufflers.I installed 2 high flow cats last week and I love the way my truck sounds and performs, nice deep rumble @ idle and a nice roar when I mash the gas pedal. I hope this helps, good luck w/your exhaust.