We have full details on the 2011 BMW 335is Coupe and Cabriolet, but why is it less powered than the Z4is? Details inside.

BMW Canada has lifted the lid on the official specs for the 2011 BMW 335is Coupe and Cabriolet.  The cars will use a 320-horsepower all-aluminum 3.0-liter inline-6 generating up to 332 ft-lb of torque.

The automaker's decision to de-tune the same engine as the Z4is, which produces 335 horsepower, is questionable at best.  InsideLine is reporting that BMW has provided three conflicting reasons why this is the case, with one official saying the six-speed manual could not tolerate more power.  A second rep said the decision was made for marketing reasons, and a third said the car uses a more restricted intake.  The real answer for the car having less power than the Z4is is unclear at this time.

With a temporary overboost, the twin-turbo engine churns out up to 370 ft-lb.  To keep the more-powerful engine cool, the company installed an extra radiator, and a stonger electric engine fan.  To accommodate the extra airflow requirements, engineers modified the front fascia to include larger openings.

As a Coupe the car sprints to 100 km/h in 5.3 seconds with the seven-speed double clutch.  Add 0.1 seconds when using the six-speed manual.  As a convertible, the car reaches 100 km/h in 5.5 seconds with either gearbox.

US specs on the car are expected to be the same, reaching 60 mph in 5.0 seconds with the DCT, and 5.1 seconds without.  Pricing on the coupe is reported to start at $50,525 with delivery.  Convertible pricing should start at $59,075.

Equipment on the car includes xenon headlights ringed in LEDs, LED tail lights, and a glossy exterior trim.  The car rides on 18-inch light alloys, which may be upgraded to 19-inch M-badged alloys.  A full M aerokit is also included, as is a collection of M Sport interior parts.

2011 BMW 335is Coupe and Cabriolet Official Details