The refreshed 2011 BMW 3-Series Coupe and Convertible will be officially revealed on Sunday, but a German forum has scored a leaked brochure giving us an early preview of the facelift models. In typical BMW fashion, the cosmetic changes are modest and are limited on both models to subtly updated head lights and tail lamps, reworked double kidney grille and new bumpers.
The most important upgrades are hidden under the hood as according to Carscoop sources, the 2011 model year 3-Series Coupe and Convertible models will be offered in Europe with revised four-cylinder and six-cylinder diesel engines.
BMW has also replaced the 335i's 3.0-liter twin-turbocharged inline-six N54 gasoline engine with the new twin-scroll single-turbo N55 unit with unchanged power and torque outputs but with better fuel economy and lower CO2 Emissions.
A previously leaked document from BMW Canada also makes word of the all-new 335is Coupe and Convertible that close the gap between the 300HP 335i (306HP in Euro spec) and the 414HP M3 (420HP for the Euro model).
According to the sales release, as was the case with the new Z4is roadster, the 335is will use a more powerful version of the N54 3.0-liter twin-turbocharged inline six of the outgoing 335i and not the single-turbo N55 engine of the facelift model.
The 335is' output is rated at 322HP (+22HP over the 335i) and 332 lb-ft of peak torque (369 lb-ft with the overboost function). Buyers will have the choice of a six-speed manual gearbox or a seven-speed double clutch transmission.
The new sporty variants of the 3-Series Coupe and Convertible range will be distinguished by the M Aerodynamics package that includes unique front and rear bumpers as well as 18-inch alloy wheels.