Tinman is correct. Tiny 9 square cm exhaust turbine on original turbo, ( maybe 2 inches across) which was chosen to help stock motor build boost quickly, but a detriment to big top-end power. Second turbo seems to address that, because power seems to climb more steeply than before, while still having near instant boost! Again, I realize that NOT using the stock turbo will give me more power, but I don't need it. I just want the extra oomph with quick boost response. And it's just plain cool thinking I have "twins" under the hood. It was my birthday present to myself! 
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2006 2500 Quad cab short bed, Smarty POD, ATS Aurora plus 4000 Compound turbos, Goerend all billet trans, CFM+ intake, Eaton Tru-Trac., Nitto Dura Grapplers 285/70/17, Bilstein 5100s, Air Lift Remote Controlled Rear Suspension, Edge Insight monitor, ATP valve cover and oil pan cover.
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