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I have a 6.0 truck engine all upgrades have been done except the lower end is stock.. Just ordered a 80mm billet wheel with race cover at little John's. My confusion is the piping. I'll be using the truck manifolds that being said do i come off with a 2.5 from the manifold and step up to what? Go 4 or 5 as soon as possible? I do plan on running a exhuast as far as the front of the rear wheels. Need a little help in this area! Thanks,Bill
 

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you can do 2.5 if u want but people will say 2.25 would be better.is this a t4 or t6 flange on turbo?the turbo has a 5in exit so if at all possibe run 5in as far back as possible.hope this helps
 

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I ran 2 1/4 all the way into my T6 S475. I think you'll find John will tell you 2 1/4. What flange?
 
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