Fred,

Help me out here. You first sentence I agree with 100%, but from there you lose me.

When does horsepower, suspension design and other intangibles come into play? What complete forula would you like to use?

If you took 150 lbs off of 2 example cars that had the same curb weight - are you saying the minimum weights could be set as easy as that?
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I think you missed my point or my point was not clear, just saying using a set subtraction ( or addition whatever ) to a OEM curb weight and using that same amount for all cars would be more uniform. From that point you could apply the process and in the end add weight to its base or shed weight for adjustments... I guess that is similar to what is happening now with the exception of the current "black magic" spec line weights.. But who am I, I still want SIR's for all cars so that their max hp is defined and limited.......