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Message: <blockquote data-quote="Monsterbishi" data-source="post: 3051" data-attributes="member: 8145">It will depend on what rpm's the engine is doing at the time, but essentially, yes. The maths behind it: (I'll work in area, so as to not bring the confusion of volume into the equation)A single 2.5" pipe has a area of 4.9087385 sq inches, assuming PI to be 3.1415, so two of them is 9.8174770 sq inches total.Compared to a single 3" pipe which has 7.0685834 sq inches, now you say "But twin 2.5's is clearly more area!" and then this comes into the equation: Friction - a single 3" pipe has a circumference of 9.4247779, but two 2.5" pipes has 15.7079632 of circumference to contend with, this being exactly 66% more surface! So for every yard of twin 2.5" pipe, it bears the same friction properties a 5 feet of 3" pipe!So it's a trade-off, 38% more volume, at the expense of 66% more friction(and physical weight assuming wall thickness is identical) which brings Bernoulli's principal into play with a short version of the magnus effect sans gravity, which I won't start on since then more factors are required for that calculation.</blockquote>