Headers should slightly increase your mileage if you keep your foot out of it, which is a hard thing to do after installing them, and most people I would imagine lose some mileage for the above mentioned reason. Forget about mods to increase mileage. As Hammer has stated and I will concur the E Fan is the only mod that might possibly pay for itself in mileage savings over a long period of time. Hemis are only going to give you so much fuel mileage no matter what you do to them

 

That is insane to spend that much money on any mod. If you have that much cash, I'll give you an address as to where you can get rid of some of it

 

I emailed pacesetter and have yet to get an answer. Their headers cut off at the 07 model range. I have an 08. Is there some kind if funky, odd difference that would not allow the pacesetter lt headers to work on an 08?

 

is the difference between longtube and short tube that much of a difference?

 

Yes there's a lot of difference. Shortys develop good torque numbers and are easy to install, where long tubes also make good torque but develop more hp than shortys and work much better in the higher rpm range than shortys, but are a littler harder to install

 

Quote:The converters on the 05 4.7 are right behind the cats on the y-pipe and then the two down pipes are ran into a collector and into the muffler then on out the tailpipes.



Hate to tell you this but the cats and convertors are the same thing, so your statement makes no sense

 

i have edelbrocks shorty headers and there not coated, i can tell you after a few years there looking pretty bad, and are reall close to the steering wheel boot, if i could do it again i would save the money and buy a coated set as well as another brand.

 

TTI Long Tubes. only because they are about the only company to offer long tubes for a 2500 4x4

 

I kno it may sound dumb but with the hemi headers work on a 4.7?