| not big enough. Really, you can't just say 2.25 x 2 = 4.5 That would be incorrect because you need to look at the cross-sectional area. A = pi * (d/2)^2 For a 2.25" exhaust you have 3.98 sq in.
For a 2.5" exhaust you have 4.91 sq in.
For a 3" exhaust you have 7.07 sq in. Big different. Even though from a 2.25" to a 2.5", it's only an 11% increase in diameter, it's a 23% increase in cross-sectional area. From a 2.5" to a 3", it's a 20% increase in diameter, but a 44% increase in cross-sectional area. Now do you understand why there is a good gain with 3" exhaust and why a 2.25" is useless for a TT?
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15:30:27 01/30/09
