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Well, of course not. And technically the NSRTs numbers were not either. SRT never does chassis dynos. But they did, and still do, I think, is to do testing under very pessimistic conditions. All such testing is done under SAE guidelines, which include things like temp, humidity, fuel quality, etc.
Now, used to be, manufacturers would "massage" the conditions to get better numbers, which is why the standard was revised a few years back. Didnt affect some makers, who were adhering to the standard right along, but a few got caught out and had to change things up.
Dinan showed once that by simply changing the amount of airflow through the grill, he could make an M3 produce whatever whp numbers he wanted. Built a damn thing almost like a wind tunnel.
In any case, SRT uses worst case conditions, which ensures that the customer is almost always getting "rated" numbers. Once you add in really good conditions, you get better numbers, which is why SRTs usually show better than rated numbers at the wheels. And get timeslips that should need more than "rated" power. Nothing in the spec says you cant use worse conditions, but most makers dont.
I used to own one of the first SRT-4s sold, bought it new in Feb 2003, sold it Nov 2006 with 75K and Stage 3. Now I drive a 2006 SRT-8 Charger.