Alright well since I helped my girlfriends brother put 3 1/2 inch stacks kinda like mini caterpillar stacks on his duramax. Home made out of drive shafts. Turned out pretty good actually.. I'm thinkin of putting stacks on my cummins... I'm thinkin 6 inch stacks about a foot above the cab. idk about the style yet.. but idk if I wanna have them on the very outside edge of the box. Or more to the center. One on each side of the sliding back window. And chrome of course. And ill try to upload some pics of his stacks. Either tomorrow or wednesday.

 

Thinkin bout putting stacks on mine, figured I'd put them in the corners and run them through the floor, with the Y-pipe under the bed. IDK, might be kinda cramped down there, I think the elbows will tuck in behind the running boards OK.

 

Umm. I plan on y piping mine in the box. with six inch stacks possibly flat cut with rain caps that open up to the sides..

 

Check it out guys...

http://www.grpipes.com/GRPowerflowCatalog.pdf

We have TONS of stuff in our catalog! Everything you'd need from a simple kit application, to all the components you could possibly need to apply a custom application. I will say this much, we've looke at for years to try and keep a y-pipe under the cab, and needless to say...it's not very easy. There are many things to try and get around, and at some points you need to flatten the exhaust, which would be very restrictive.

Just some food for thought! If ya'll got any questions...let me know.

 

A buddy of mine had them closer to the center an I liked the way they looked! Probably cuz you dont see a lot of ppl do it like that! Cant wait to see the pics

 

Yup I might try to put the stacks more center of the cab.. I just don't know how its gonna look if they're sticking 1-2 feet above the cab.. when that time comes ill ask for opinions haha.. but anyhow.. ill try to get pics of the home made drive shaft stacks that are on my girlfriends brothers Duramax today hopefully!!

 

3 1/2 inch stacks? Thats gotta look goofy on a full size pickup doesn't it?? We put 6 inch Cat stacks on my buddies 06 Cummins and they looked like the perfect size

 

It don't look to bad for home made out of drive shafts... They look a little small.. but its not my truck.. haha.. when i do mine there gonna be 6's and taller then the cab. Ill try to get a photo up or 2 can barely tell there until the smoke starts rollin..

 

This is my buddies 06 with the 6 inch cat stacks

 

Nice!! That's the way I want mine but in chrome and maybe closer to the center of the cab.