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Uh...if by groovy he meant "better than E16" then you either have a turbo or MPFI...thats all it means...its not really all that special if theres an E15 head on an E15 block, but if you have a "groovy" head on your E16, then your getting several performance enhancing features (larger intake bore, thicker casting, smaller comb. chamber) different than stock.
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