MotorTrend reviews the 2013 BMW 335i xDrive equipped with the M Performance Power Kit and M Performance Parts.
The M Performance Power Kit is available for the 2012 model year and later BMW 335i Sedan and 335i xDrive Sedan models. The M Performance Power Kit joins the existing M Performance Parts line which includes chassis, aerodynamics, exhaust system components, and trim accessories.
The M Performance Power Kit is available with an MSRP starting at $1,100 (plus Installation) and retains BMW’s 4-Year / 50,000-mile New Vehicle Warranty when purchased with a new vehicle. The BMW M Performance Power Kit features comprehensive engine tuning via advanced software 335i and 335i xDrive Sedan models. The kit includes updated software or replacement engine DME (electronic control unit), high-capacity engine air intake system, signature BMW M Performance engine cover, and rocker panel decals. This gives the 335i Sedan or 335i xDrive Sedan a substantial power boost (+20 horsepower) while retaining the original 50-state legal emissions certification and fuel efficiency ratings.
Let’s have a look at the review by MotorTrend:
Among our test car’s long list of optional features were a few items from BMW’s M Performance parts catalog. The M Performance Power kit ($1170) adds a revised ECU unit, new air intake system, and rocker panel-mounted M Performance decals to hint at the extra oomph under the hood. The kit boosts the 3.0-liter twin-turbo inline-six’s output by 20 hp and 32 lb-ft of torque to 320 and 332, respectively. 2013 BMW 335I Xdrive Rear End Given the solid 0-60 time, the 2013 335i xDrive was predictably strong on the quarter mile, with a recorded time of 13.0 seconds and a trap speed of 105.4 mph, just 0.4 seconds behind the DCT-equipped M3. The eight-speed transmission is the definite superstar of the powertrain. It may not be a dual-clutch unit, but it sure does behave like one, with quick and precise shifts. Part of the credit goes to the “sport” transmission option ($500), which shortens shift times and adds steering wheel-mounted shift paddles. Additionally, the tall eighth gear allows the inline-six to spin at a low 1700 rpm at highway speed, achieving a fairly efficient EPA rating of 30 mpg on the highway. (Its city figure? 20 mpg.)
The sedan exhibits a fair amount of body roll when pushed to the limit. Some staffers felt that the suspension tuning was a bit on the soft side, despite our tester’s adaptive dampers (part of the $3200 M Sport package). Unfortunately, xDrive models don’t get the M Sport suspension calibration (stiffer shocks and springs and 10mm lower ride height), which probably would’ve allayed some of the clumsy behavior exhibited during hard driving. We also noticed a slight oddity with our tester’s 18-inch summer tires, thanks to some investigating by associate road test editor Carlos Lago. Instead of the staggered setup that comes from the factory, our wheels were the same width all around (BMW says they couldn’t get the wider rear wheels in time).