[TCracingCA]

Is that the rules by the various organizers whether that be FIA past or present, Trans Am past or present, SCCA past or present etc. dictated what Porsche chose to build or why a model was Homologated! Thus Porsche then makes the decision as to whether they want to be in a certain class etc.. But in the modern some of these organizations are getting smart and have asked Ferrari, Porsche, Mercedes if they were interested in participating and then some sharing of the future rules has occurred.

Thus because of the rules (and I will only take a small segment of the Porsche history): 1971 The "S" was the car. LeMans and FIA developed rules for Turbos, so Porsche fielded Turbos in the 911, and would build RS's and then RSR's, the IROC cars, and the 911 Turbo cars were essentially cutting edge which caused some rule tweaking and thus caught them out for a few years during the RS and RSR reign! But then that all evolved to the hybrid in between 934, and then eventually the 935 here in the states was finally greenlighted for competition late 1977, but formally for the 1978 season, but had FIA classes in 1976 in Europe and onward thru the dominating late 70's and into the 80's, and actually earlier starting with those first Turbo 911's, but due to the rule mods on fuel consumption etc.. They had a pause in appearances especially until other Manufacturers came up to speed and the organizers created what everyone was accepting as fair rules come essentially in 1976 in Europe and about 1978 here in the States essentially, But then Porsche kept winning and thus developing, etc.. Porsches success comes directly as a result of their flexibility and desirability to evolve their models and to outlay the budget quicker and better than any other Manufacturer in History!

Also don't beat me up if I am off by a year or so. above without pulling out books and such!!!!! I am just trying to give the basis of the reason why models are built and why they choose to build this number or that!

Thus in the modern-- 911 Turbo not designed to any particular racing Class that exists, but you still see a whole bunch of very fast Turbo's at enthusiast level events. Thus over the years we have had Cups, and the latest turn key racers for sell have been the GT-3 RSR's. Thus the creation of the GT-2 RS and such and special limited built Caymans and such seem to still be dictated by the Racing Rules or future Racing Rules! But also the Manufacturers are just trying to have multiple offerings for every budget and level of Performance also.

Thus my answer would be actually the 1967 911 R!!!!!!!!!! If you truly know Porsches history!!!!! Then second would be the 1972 911 Turbos that ran at LeMans and such! The 935 Baby didn't benefit the 911 lineage, therefore that was development that led to the 936 and 956/962's! And some would argue the 911 Turbos from 1972 because that also was a smaller displacement, but it was the first turbocharging of the 911 lineage and sure came as a development of the 917/10, but those 911's demonstrated the feasibility of running Turbos in Production based classes Group 4, Group 5!

And I can go on! Get the point! My opinion! Unless you want to get deep on Mag cases vice Aluminum and the advancements on the Turbo and such and really get into it! Oh yes, put one of the smile post things here and a beer toasting one also!