"A new performance-oriented 335iS model endowed with an M-sport styling kit and unique chassis settings heads the list of changes BMW brings to its facelifted 2011 3-series coupe and convertible.
Set to slot into the lineup between an upgraded 335i and the M3 when it goes on sale in March as an exclusive for North America, the 335iS runs a tuned version of BMW's N54 engine, as found in the recently unveiled Z4 sDrive35iS, coupled to either a standard six-speed manual or an optional Getrag-engineered seven-speed dual-clutch gearbox.
The twin-turbocharged 3.0-liter inline six-cylinder engine of the 335iS adds a special software package to bump power by 20 hp over the 335i to 326 hp
and lift torque from 295 lb-ft to 332 lb-ft--or to an even gutsier 369 lb-ft for short periods
via an overboost function that unleashes added turbocharger boost pressure.
BMW puts the new 335iS's 0-to-60-mph time at just 5.1 seconds in standard guise, or an even sharper 5.0 seconds when running the optional dual-clutch gearbox--making it just a tenth of a second slower than the acceleration benchmark of the standard six-speed manual M3. Top speed is increased by 20 mph over the 335i, taking it from 130 mph to 150 mph.
In other changes to the facelifted 3-series coupe and convertible lineup, BMW upgraded the 335i. It receives a new N55 engine running a single-scroll turbocharger in place of the twin-turbocharger setup of its predecessor, albeit without the performance software package. Power and torque remain the same as on the existing 335i, at 306 hp and 295 lb-ft respectively, with the cutout pegged at 7,000 rpm. Official performance figures put the 335i coupe and cabriolet's 0-to-60-mph time at 5.3 seconds in standard six-speed manual guise or 5.5 seconds with BMW's optional ZF-engineered six-speed automatic. Top speed is limited to 130 mph.
All 2011 3-series coupe and cabriolet models receive revised exterior styling. The changes are subtle, extending to the traditional kidney grille, bumpers, lights, exterior mirrors and wheels. They also feature a similarly subtle interior upgrade that includes a new multifunction steering wheel and dark burl walnut wood."