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Originally Posted by Rowens V-Spec
So the optimum exaust tubing is dependent on where you want your power curve? Like a smaller tube for more low rpm power, and bigger for higher rpm curve. So midrange will optimize high and low end power?
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Speaking in general, yes, but I can only really answer that if I was able to dyno test all sorts of different sizes, but I can guess that 2.5 is going to be the best for a Spec-V. You might lose a little bit off your bottom end, but for your powerband you are getting the optimal size, and you could go bigger and probably get a better top end, but lose too much low to mid power to make it worthwhile.
I forget what car it is right now, I think the new Corvette, but there is one that has baffles that restrict the exhaust at low RPM's to maintain exhaust velocity, but open up at higher RPMs, so you get optimal exhaust size and velocity for the entire powerband.