Originally Posted by powerstrokedlariat
I just got the 4'' turbo back straight pipe from Welcome to Farmboys Diesel
and love it. I was running the btm muffler for about a year but that is nothing compare to this. I like the flutter myself, and it really turns some heads. I have wicked wheel, predator on 60econo, 4'' straight pipe, 6637 intake, zoo-dad mod, and factory tech vb.
Service from Gus at farm boys was very good.
The reason it sounds so diff and deeper tone is due to the pipe, the 4" pipe does nothing but slightly reduce egts and a deeper tone.. 5" like myself is even deeper..people just stare at me its stupid loud i think but only under WOT cruise speeds noise is perfect, you really wont notice a huge jump in mpg here..maybe .2 lol its not much bigger then stock, and 4" and 5" are over kill just sound sweet. a stock exhaust with no muffler is good for 400Hp all day long..
The wicked wheel doesnt add mpg either, its an old style compressor wheel out of an earlier Duty, it will actually make you lose 1-2psi in boost but will help rectify surge, if you dont have surge then leave your wheel in there.
The 6637 intake is a good intake, they get dirty fast but i just blow my filters out, this is a good mod but im in the market for a new intake..something i can sink in some water every now and then, there is a guy out there that sells socks for the 6637 as i have one and its a great addition, keeps alot of dirt and mud out. this also wont greatly increase mpg..maybe .1 or .2..
Valve bodys- THANK god someone listened, these help alot, youll save your trans alot longer then leaving it stock.. GOOD addition and smart before chipping.
Tuning is the only MPG jump youll see, unless you have a lead foot, now also if you run a lift and bigger tires kiss that MPG jump away..