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A few other things....
Conventional IC engines are designed to operate on the axis they are originally designed for. There are many resons for this. I might also add that simply gaining a straight path out for the exhaust will gain little to nothing, and might have negative effects because of a few factors. The most obvious being back pressure, which a 2, or 4 cycle IC engine needs to an extent to opperate at it's peak performance.
I can also say that unless you had a degree in flow dynamics, there is no way you will be able to design an exhaust system more effecient than the stock one on your car. There will be trade offs involved, such as you might get a quarter HP from making an exhaust manifold straight....completely straight, but then fuel mileage might suffer....you see what I am getting at?
Peace out, and live Green!
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