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Old 09-05-2008, 12:32 PM   #7 (permalink)
Master EcoModder
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Join Date: Apr 2008
Location: Massachusetts
Posts: 409

Eco-Fit - '13 Honda Fit Base
90 day: 37.06 mpg (US)
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It's difficult to make a sand cast head with intricate details like these grooves in it, and labor to make each groove by hand before installation isn't justified by the ability to charge for the "Now with Singh-grooves!" head. That's my theory. Think how aerodynamically dirty stock intakes/heads/exhausts are, and then how much "cleaner" aftermarket units are. That sums it up. Cost to benefit ratio is too small.
American by right
Ecomodder by choice
Hypermiler by necessity

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