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ss3011 · 11-06-2018, 05:27 PM

Duncan works in the GM Performance Center where they build all the COPO engines .

11-06-2018, 05:27 PM	#9
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 909 Likes: 70 Liked 239 Times in 114 Posts	Re: COPO Horsepower adjustments Duncan works in the GM Performance Center where they build all the COPO engines .