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between a 4" and 5" exhaust your not going to see any difference in mpg. The factory
4" exhaust is a good breathing system once you drop the cat and/or replace the origional restrictive muffler with a free flowing design.
I cut my cat off and put a magnaflow muffler with a chrome tip that I bought from a local exhaust shop. Made the ole stock stuff look and sound pretty good. I have not really seen any differance in MPG but it sounds bad .
__________________ -2004.5 laramie-Magnaflow muffler,silencer ring MIA , AFE Stage II cold air kit..
The turbo will spool more efficiently when your exhaust is relieved of the back pressure caused from the restrictive stock muffler. If your able to keep your foot out of it once you’ve got it sounding nice you will probably see a gain in mpg.
check what you're getting. some 5" kits are 4" to the muffler and 5" out the muffler. i bought a Grand Rock 5" turbo back system just for that reason. i figured it might be a nice sound compromise with better flow than a standard 4" system.
'95 Ram 2500 CTD 4x4
5" GrandRock turboback- HTT manifold-#5 TST plate-TST AFC spring w/washer swap-KDP tabbed-Fluidampr
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