Hey guys. I have a 03 f150 supercrew 5.4L and I'm wondering what's the best exhaust setup. Right now I have stock exhaust with cherry bomb extreme muffler and 3" tips. They have been on since the truck was purchased by grandpa right off the lot in 03. The tips are rusted on the bottom and everything, and the donut gaskets on the manifolds are worn out and making a ticking noise. So I figured it's time to upgrade the exhaust completely. I'm gonna go with bbk shorty headers, 2.5" piping, two magnaflow high flow cats #94106, true duals, two flowmaster 40 delta flows 2.5" single in/single out, and 3" by 18" tips. Will I gain any mpgs and hp at all? And will it have a good sound to it?

 

Sounds good.....but if you're going to do that much work you might want to forget the shorties and install obx long tube headers.....

 

... And you need an x-pipe

and lose the pos fartmasters....

and go 2.25" pipe

...or, forget any torque preservation.

btw - no mpg gains, sorry

 

I actually thought about the obx lt's. I hear they have a great exhaust flow and sound. Just don't know much about them. I will look into them more. Thanks.

 

I should go 2.25" piping? Isn't that stock piping size? Also, which muffler do you recommend?

 

Also, you have a link that I can look at those obx lt's? When I search them, only blogs and forums show up. I need a link on a place to buy them at.

 

http://www.sparktecmotorsports.com/h10792s.html

 

Trust him, he is trusted mekanik from glorious motherland.

 

2.5" is stock yes, but in a single system not dual. For the best low end torque, go with dual 2.25. For best sound, go with 2.5"

Flowmaster is out. Especially if your wanting increase in anything. Stick with a straight threw design muffler.

 

Magnaflow has good straight through mufflers, borla, banks power, cherry bomb glasspacks, and many more. Borla xr-1 are my favorite, but it will cost you.

 

Okay thanks. I heard about that I should stick with a straight through design muffler. I'm probably gonna get the magnaflow magnapacks. Also, should I run straight duals, or duals with an x pipe?

 

With X pipe. ^

 

X-pipe. But make sure you get the magnaflow tru-x, x-pipe. Ive heard with anything else, you will get drone.