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me that of everything I've read, 2.5" is just fine unless pushing enormous amounts of horsepower. Last time I checked, Pi*Radius^2 = Area of a circle. So let's say that's 3.14159*(1.5)^2 = 7.069 sq. inches for the single 3" exhaust. In the dual 2.5" case, we have 3.14159*(1.25)^2= 4.908. So 4.908*2 (because it's dual exhaust) gives us 9.816 sq. inches. Therefore, there is increased area for dual 2.5" over a single 3". Now, back in the big block hayday, my dad ran a single 3" exhaust on his 427 big block. If that's good enough for him with 7.069 sq. inches of area and 400 hp, then my dual 2.5" with 9.816 sq. inches of area should suffice me for lots and lots of horsepower. I'm really not concerned and I just think dual 3" is overkill unless you have real big turbos (at least JWT 650's, GT2530's, or TD05's)...just my opinion of course! I'm not affected by Greg Dupree like you are assuming. I'm only interested in the numbers. But I do love his downpipes and will probably get a set!
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