is slow (facts when comparing similarly priced sports cars, or cheaper sports cars)
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Slow is a quite relative term. Pit the Mustang GT against a same year M3 and look at the power numbers, then take into account the power/weight and also realize the M3 is a mere 3L I6 as compared to the GT's 5L V8. You get what you pay for in terms of efficiency and potency. US or Euro spec, i don't care, hell run both of them against the Mustang in that comparison.
I don't really blame your choice in Vette vs M3 though. The Vette is much lower, lighter and has a bigger power/weight.