Might gain some mileage. Ive seen a few trucks do decent. Not every truck responds the same to the same mods far as power and mileage.
They are a lil louder then stock if a muffler is used. If its too loud, I end up installing 2 flow threw mufflers.
Best part about bigger exhaust is it will help with egts. Duramax's run HOT. Way hotter then a cummins or a ford - even stock. When I do get to do a duramax exhaust I end up installing a downpipe too. It also makes a good difference in egts and engine temp. It kinda snowballs from there in mods too. Duramax's even run better with after market exhaust manifold and up pipes. Did a '11 LMM, its gets almost 20 driving around town.
$270 is a decent price for exhaust. I can buy exhaust cheaper then that. Few places online will sell it for that much shipped.
Dont forget to run fuel additive - diesel now days is kinda abrasive
This post was edited by Matt L at 21:14:01 12/14/12.
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