[v10_viper]

I have almost no back pressure because of no cats, or muffler...but there is going to be back pressure no matter what, unless your running without headers at all. Because of the bends and the design of headers/manifolds there will always be back pressure, I think how much back pressure is the question.

I think that the exhaust valves run hotter or something but i dont think that's a very serious problem. On some newer engines I know that they do require a certain amount of back pressure though, plus with all these computers and o2 censors your engine could run rough if you got rid of all that cuz of the nature of the stock ECM, right guys??

On my truck, 350 motor, it runs stock manifolds, then it goes together in a 3" tube, then splits back out to 2.5" tubing before the rear axle and then it's got it's shiny tips of course. It's been this way for 50,000 plus miles because it was this way when we bought it, if I keep my truck though I'll be redoing the entire exhaust. You could always just go with straight exhaust, then throw some glaspacks(i hate them though) on there or some Flowmaster mufflers or w/e, and it'd still sound downright sweet.