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A Dynojet is only about 5-8% loss whereas a Mustangdynomometer is 10-12% loss. It depends on the brand of dyno.
My buddy just sold a 2002 911 Turbo with the X50 package rated at 450hp and I have driven several late model Mustangs. My buddy's 911 would pull me on the highway but would be a close 1/4 mile race. Only the GT500's with aftermarket pullies (pre 2013) will beat a C5Z. These cars are the best bang for the buck n/a'd cars out there IMO.
I have two buddies with GT500s bone stock, one is 2013, one is a 2014, both walk on my Full Boltons + a Cam pretty bad. I've won off the line, but once we hit 3rd i see tail lights.
Its the only stock car I've lost to (not saying there aren't more that can beat me), but I haven't got to try a ZL1, or C7 yet... I'd love to tho.