Yes there are guys running 13mm pumps and s400/s500 twins on the street. The problem with that is you could actually beat some stop light to stop light making way less power because it takes some time to spool turbos that big. I prefer the fastest spool to the most power. That is my opinion and therein lies the problem with your question. It is very difficult to quantify what everyone says is acceptable lag time. There are just too many variations.
96 3500 5x018 7mm dvs 62fmw
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1996 3500 4x4 5spd
1991 D350 5spd
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