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Regarding lsx exhaust next time your around a corvette or camaro check out the stock manifolds then check out a trucks. They are totally different the truck manifolds suck. Corvette or camaro manifolds would be a huge improvement over truck manifolds but thats not smog legit in Commiefornia.
One thing about automotive manufactures I think alot of people dont think about is cost. Yes they want to say they have vehicle type (fill in the blank, sedan, coupe, pickup, ect.) that has the best epa mileage. But these things are typically true for "ideal" conditions. Those of you who haven't read my intro thread please do all my "stats" are there (link to it in my sig). My driving conditions demand alot from my vehicles. That said if one part of a vehicle will cost the manufacturer $100 more then they otger part, draw those numbers out over 50,000 units a year. And in the case of my Silverado they were basically identical from 99-06 (aside from a few cosmetics). Yes they want the best mpg numbers on the market at the time of launch/sale but don't you think they would rather have the cash in their hand? Smaller initial investment with basically the same return. Please don't always beleive "factory is best" as it may be for cost but not all ways performance or effiencey.
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