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2.5" vs. 3" cat or Y back exhaust?

20260 Views 30 Replies 11 Participants Last post by  Strategy9
In a previous post I asked about quiet performance mufflers and pretty much narrowed it down to Dynomax super turbo or Walker quiet flowSS in a large size can, single outlet. My exhaust guy says he'll do either 3" or 2.5" tailpipe w/muffler for $170 but if I want him to wack off the end of the Y and put on a better 2" to 3" collector then do 3" all the way it'd run about $250. Both sound pretty reasonable to me, here's the question for an '04 4.7L 4x4 DAk QC:

With only mods planned being a set of HO cams and moddified TB plumbing to modded air filter box lid(larger) & an sct tune is there really anything to be gained or lost by going to 3" ex. pipe all the way with my few mods? Bottom to midrange is what I would hope to increase. My impression from searching is the general concensus is that the 4.7L engine likes 3" plumbing, is this in all cases, regardless of mods or lack of? Thanks, Mark
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Single 3 inch, dual 2.5 inch
what about this setup i got it at the exhaust pix thread http://www.dakota-durango.com/forum/showthread.php?t=132935&page=3
im sure he has the 360 but could be an idea for you

edit: but instead of having it dump you could run it out the back or whatever
Whos set up is this?
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