I am beginning to wonder if bigger is really better when it comes to exhaust. I bought Corky Bell's Maximum Boost and his chart shows that a 2.5" diameter exhaust is good for up to 500 hp (which is farther than I will ever go). Exhaust engineers say that too large of an exhaust will cause the exhaust to cool quicker and just makes it more difficult to push the (increased density) air through the exhaust. Does anyone have any data showing that a 3" diameter exhaust system is better than a 2.5" system? (No opinions please) .