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2.7ltr is a high powerd car over here, the 2.7ltr can easily follow a 4.6ltr mustang.
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Only if it has forced induction (turbo and/or supercharger); The Mustang's V8 is naturally aspirated. Also, I'd seriosuly doubt there are many (if any at all) 2.7l V6s that can match the power and torque of the Mustang's V8, given that BMW's new N54 3.0L twin-turbo, direct-injected Inline-6, just barely exceeds it in horsepower and falls short on torque:
BMW N54 I6; DOHC 24-valve, twin-turbo, direct injection:
306hp@5800rpm
295lb-ft@5000rpm
Ford Modular V8; SOHC 24-valve, naturally aspirated.
300hp@5750rpm
320lb-ft@4500rpm
Anyway, one thing to remember that in the US and Canada, there is no tax whatsoever based on the engine's displacement (only a one-time gas-guzzler tax; which as the name implies is based on fuel consumption), so it usually makes more economic sense to simply opt for a bigger engine if you want more power. This is also the reason that OHV (pushrod) V6s and V8s are still common here, even in performance applications (the Corvette is probably the best example): OHV engines may not generate as much HP relative to their displacement, but they're cheap, compact, and usually have flat torque curves.
Generally, only engines specifically designed for high-performace or heavy-duty applications have forced induction over here.