3" single shot exhaust question

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not sure, but i think there are guys with 3" downpipes into the 9's, so i don't thing a 3" single exhaust will ever really be a restriction for 99.999% of the general public.
 
The website for the new RJC 3" system says opening the dump pipe on a 10 second car didn't show any gains.
 
I have a 3" dp and single exhaust on my car. Took the exhaust off for some runs at the end of last year. Did not see any major gains.
 
I ran 9.40 with 3" down pipe and 3" ATR single shot. It didn't go any faster with open exhaust.
 
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