Compared to F1 the LMP1 cars are heavley restricted, If you took a current R8 for example and stripped off all the mods imposed on it to slow it down since it was designed then it would be 2-3 seconds a lap faster I think, may even be more.
The GT1's (which I guess you are right, the 917 would be if we turned the clock back due to a quirk of rules) have much less aero grip relative to the F1's now than the late 60's early 70's when similliar downforce was produced by a sportscar body to a F1 and had more power.
Not sure of the DTM rules, but how much of the base car is there in any racer now?
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