Quote:
Originally Posted by Allch Chcar
A smaller exhaust is better for MPG since it helps with velocity and therefore torque at a lower RPM. If you keep below 3k rpm where the exhaust isn't restricted a "pea shooter" exhaust would work without a problem. A bigger exhaust would only help upper RPM torque and even more so with a turbo car.
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With that being said I'm surprised they (the environmentalists) haven't tried making their own custom eco headers! Or have they and I just haven't bothered researching it?