From the BMW press release, sounds like SW plus additional radiator,
Quote:
More Power.
The BMW 335is is powered by BMW’s widely-acclaimed “N54” twin-turbocharged inline-6, which displaces 3.0-liters and features all-aluminum construction. The engine further benefits from BMW’s High Precision direct fuel injection, Double-VANOS stepless valve timing, and advanced Digital Motor Electronics (DME) engine control system. For the 335is Coupe and Convertible, the engine has a heavy-duty cooling system and has received special software that allows the N54 to sustain a nominal output of 320 horsepower and 332 lb-ft of torque. Through the use of temporary overboost in certain circumstances, the engine will produce up to 370 lb-ft of torque (horsepower remains 320) for even better performance during overtaking and other high-load / high-speed maneuvers.
The increased power and torque naturally place higher loads on the engine componentry, so a number of items, including the cooling system of the 335is, have been upgraded accordingly. An additional radiator has been added behind the left-side front air intake, along with a more powerful electric cooling fan. An oil cooler is fitted opposite the second radiator, on the right side. The front fascia of each model has been shaped with large openings to allow improved air flow to the coolers, and special emphasis was placed on the 335is Coupe’s higher probability of being used for spirited driving. As a result, the 335is Coupe has traded the Convertible’s foglights for the largest possible air openings, which help result in a substantial increase in effective cooling capacity over the original BMW 335i Coupe. These measures were taken specifically to ensure that the 335is will provide constant, reliable power under even the harshest driving circumstances. Engine mounts have also been replaced with stiffer units to help minimize deflection under very high G-loads.
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