My z/28 did 335 h.p. at the wheels with Lid, headers and a stock catback. After I added PRC 5.3 Heads, mild 228 cam, Fast 90 intake it put down 420 h.p. /400 t.q. at the wheels.
The dude just proably doesn't understand how to down shift or what gear to start in. I remember people "racing" me when I first bought the car. I left it in 4th gear and stomped on it at 30 mph, rather than getting sideways in second.
You're probably right.
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