Now, for your turbo back, all your gonna get is 4'' till you hit the stack itself. Im not a 6.0 guy and i don't know how big of piping you can go. But IIRC i think a 3.5" DP is the biggest your gonna get and 4" DP back is going to be all you need.
On Edit; like mentioned above. Chrome Stack Mafia will set you straight. Give em a call or click the link.
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I have 4"downpipe into 5" running into my 6"stacks...all you need to do is get a 3.5 to 5 adaptor then a section of 5" running to where you do your 90 up into your bed...go to a trucking supply place for everything you need or even napa can get it all
Ya i was just want a 5" turbo back stack kit. Kind like the 5" turbo back exhaust kit but only in stack form. Is there alot of difference between 4" and 5", i heard 5" sounds better. Im wanting to also run a 8"x36" Black stack