idk if this gos for deisels too but if i take out the cat and muffler will my truk be ok? cuz idk like a gas job u need back pressure do u need it in a cummins? or can i run straight pipe 3" to a 4" stack ?

 

cat? muffler? on a diesel wow i didnt know they had them. sorry had make a joke but yea get rid them. it will sound alot better and your egts will drop some. just long as the truck is not a newer truck with the dpf and all that junk.

 

no its a 94 so i should be good then

 

yep your good. Turbo = backpressure the more flow post turbo the better.

 

i got straight pipe on mine no muffler no converter i love it and it cost me nothing i had the aluminum pipe laying around and my buddy welded it for free

 

you can even go bigger i am running straight 4" and thinking about going straight 5" with a single stack

 

ya i have 4" turbo back to a 5" stack and i think im gunna go with a bigger stack haha but right now it still sounds amazing

 

haha do it, i have straight 5" and might get a 7" tip

 

i am running a 4" down pipe right into 5" pipe all the way to my 5" stacks

 

I've got a full 4" straight pipe from turbo back,and love the sound.