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1500's are not eligible, 997 homologated only for G4 ( HRS let 1500's run, and they're pretty quick )
basically JT wants to keep it homologated, or 1340 or less. to try and level it off. There aren't any GT's homologated with 1500's (that I know of) so its 997, 1200 and 1340's thay're actually pretty efficient engines so should be a match for an A series
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