a pair of right sized ball bearing turbos will gove you boost from less than 2000 rpm, and lag will be neglible.. the upside is that they will be at full boost say 10 pounds in the whole range where a positove displacement will ramp boost....
and if you are only shooting for 500 rwhp you should be able to get some very tight turbos... the best solution, bit a hard one engineering wise is a pair of VATN turbos that will give you exactly wjat you are looking for (vatn=variable area turbine nozzle) but they dont come in very many sizes... so a pair of OEM mercedes diesel turbos could be the ticket, but yoy need to talk to a turbo shop who know what they are doing...
schwartz extreme perf could set you up with both manifolds and turbos...
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Elwood:We're 105 miles from Chicago, we have a full tank of gas, half pack of cigarettes, it's dark out and we're wearing sunglasses.
Jake: Hit it.
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