I'm thinking of using the 2.0 for high compression and flow. I've seen some porting data that shows the round port heads really flow after porting:

Lift..0.100 .200 .300 .400 .450 .500 .550 .600 .650 .700

OVAL PORT:

I.....63..122..179..218..229..236..244..240..240.. 237

E....55..110..154..181..192..194..199..201..203..2 04

D-PORT:

I.....64..126..183..220..230..236..239..238..237.. 233

E....54..109..151..174..181..187..192..194..197..1 99

RANGER (round port):

I.....64..131..192..229..241..252..256..254..255.. 256

E....60..123..174..196..203..208..209..211..214..2 15