7" for a pretty much stock truck is gonna be way too much. Will it hurt performance? I dunno, you are going to still have a 3 or 3.5" downpipe and probably 4" up to the point of where it goes through the bed. It might be ok, but I haven't tried it nor have read of anyone putting stacks that size on a pretty much stock 6.0.

 

no it shouldnt hurt it to put a stack on it it will just be like a big tip on a regular exhaust, cause like stated above your still gonna have a 3-4in pipe comin into it so it wont hurt nothin

 

it will be fine, do it.

here is something for your ears...

 

that sounds mean as hell but i take it mine wont sound as good as that sense is it still stock right. sorry im still kinda new on what the 6.0 really can do or sound like

 

my bosses truck has a edge wit attitude and a cold air intake then i stright piped it with a 6in stack and sounds just like the truck in the video.

you truck stock with just straight piped and stack will sound just like that.

 

very niccceee....!!!!

 

that sounded pretty badass slowtow pig!

 

i have an early 04 f250 and i put muffer back 4in grand rock powerflow kit in with 5in bull haulers. it sounds great and i think it performs even better i also have a k&n cold air intake. i would definetly reccomend it you wont be sorry

 

I used a pry bar and carefully worked it out,its pressed in pretty good. I did this at work with an f-350 and 2 buses that have vt365's in them. Those 3 vehicles now make a mean ear piercing whistle and you can hear it from 1/2 mile away. I'll try to some get pics of how to get it out.

 

Only certain early '03 6.0 motors have a removable silencer ring on the compressor housing. Otherwise you need to do some machining to remove the ring. For all the work it's little gain for anything that really matters.