![]() The upgrade brings a higher, 155-mph speed governor as well. And Ford Performance retuned the electrically assisted steering rack, anti-lock braking, stability control, and selectable drive modes. A strut-tower brace sticky 19-inch summer tires, sized 255/40R-19 and a 3.55:1 limited-slip differential are also part of the package. The High Performance package inherits equipment from the more powerful Mustang GT and its available Performance package, including larger 13.9-inch front brake rotors with four-piston calipers and a thicker rear anti-roll bar. LOWS: Inescapable four-banger stigma, constricting optional Recaro seats, Camaro 1LE counterparts are cheaper. Unlike V-8 models, though, four-cylinder Mustangs do not feature automatic rev matching for those who can't heel-and-toe shift. Of course, we have a sweet spot for the Mustang's standard manual transmission, and the six-speed's notchy shifter and progressive clutch action don't disappoint either. The latter mode proved better for maximizing thrust out of tight and twisty corners simply tickle the throttle and the automatic will snap into the optimal gear and hold it to redline. Even the optional automatic gearbox's ability to smoothly shuffle its 10 ratios impresses, both in the default D position and the sportier S setting. 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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