While there's a brief hesitation in throttle response just off idle, the 2.3-liter is entertaining and encourages you to chase its 6500-rpm redline. The updated engine's aural character and throttle response are notably better than the Mustang's base turbo four, growling like a baby lion at startup and snorting through the rev range. We were immediately smitten by the EcoBoost's newfound voice on our drive along California's snaking coastline. Ford says the RS-derived EcoBoost mill brings broader horsepower and torque curves the engine is most responsive between 25 rpm. Output is now 332 horses-18 less than the RS made-and the same 350 lb-ft as before. Also added were a larger twin-scroll turbo compressor, a bigger radiator, and an active exhaust system. Ford accomplished this by recalibrating it to work with the standard six-speed manual and optional 10-speed automatic transmissions, as well as making it work long-ways in the rear-drive Stang. The newly available High Performance package swaps the base EcoBoost spec engine for a detuned version of the 2.3-liter unit that powered the all-wheel-drive Focus RS.
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