Forced Induction Tuning has been doing this for years to the CTS-V.
Many hours of dyno testing over the years has tuned this to a very conservative 850 rwhp that idles like glass on pump gas. He has done a few with single turbo's, but for the street small twins work better in all lower rpm applications.
Agreed it is over kill and I'm sure with a cam and a much smaller pulley on the SC 850 rwhp might be doable, but I'm not looking for an aggressive sounding engine. I want it to drive like a Cadillac... And under the hood looks amazing now.
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