im thinking of doing a dual exhaust system into stacks, im thinking of doing either 2 4in straight pipes to 2 5in stacks or two 3in pipes to 5in stacks will i have enough back pressure to do this?
thanks
nick

 

Even dual 3-inch is too big in my opinion. You'll likely lose a bit of low end. Do your wallet a favor and run dual 2.5 inch up through the bed and then slip the five inch over it, keeping the 2.5 inch tips below the top of the 5-inchers so only yu will know. You get the look without any loss of low end.

 

or weld an adaptor plate to the bottom of the stack lik mine and tack a little piece of 2.5 to join to ,, the sound is a huge difference ( for the better) comin outa big stack 5 inch is bout right btw thats just my opinion tho

 

so ur saying go from the 2.5 to the 5in stacks? what if i went to a 4in pipe but kept it on the one pipe with the 5in stacks? cus im trying to get it more free flowing to lower my egt's
thanks
nick

 

more air in and more air out means lower egt's and more power.i dont think ya gotta worry about back pressure with a diesel.they are a breed by themselves.more guys will jump in to help you out as well

 

Yep I think the less back pressure the better it will run

 

I think you should do the 3" straight pipes with an addaptor to 5" stacks

 

The less back pressure the better ...

-Enjoy
fh : )_~

 

correct, you dont want backpreasure, period

my 7.3 with just 2.5" straight pipes
straightpipe73.flv video by mustangman02232 - Photobucket

 

that thing sounds pretty sweet

 

i hate school computers they have it blocked so i cant watch it so the less back pressure the better cus right now i have just a peice of 3in that ends befor the rear tire (ext cab 8ft bed) no muffler so i should be fine with either 2 3in pipes to 5in stacks or one 4in to 5in stacks no which one will give me lower egt's
thanks
nick

 

I would say the duel 3" to 5" stacks. But might not be a ton of difference between the duel 3" and the single 4". But if I had to say it would be the duel 3"

 

so you think the dual 3in will lower my egts better than one 4inch?
thanks for all the help so far guys
nick

 

You need to do the math I'm pretty 1 4 inch will flow more than dual 2 1/2 not sure about dual 3 inch. the bends plays into it too.