Hmmm...the only one I've seen was done by a Z magazine that tested a before and after dyno on a stock Z. They tested the JWT Pop Charger and got 6.5 HP increase, and the power increase started at 5000 RPM, then peaked at the usual 6200 RPM. They said it was the best they've seen--here's the link: http://www.nissanperformancemag.com/june03/350pop/
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