If memory serves, we tried flat plate restrictors on the BMWs before we went SIR.
Related note: a lot of folks ask "why won't the scrutineers tear down engines?" Simple answer is that unless it's put into the supps (such as it is for the ARRC and Runoffs) if a tear-down is done then the Region has to pay for the repairs if the engine is found compliant. No one's going to do that.
It's easy to get away with non-destructive tests (e.g., Whistler, weights, track, brake size, checking for plates, etc) but you'll be hard-pressed to find a region and/or its scrutineers that will take the initiative to do tear-downs. - GA
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