Like the redesigned 535i, the 135i will drop the current 3.0-liter twin-turbo inline-six for the new twin-scroll turbocharged 3.0-liter inline-six (dubbed the N55). While it doesn't sound like a huge change (both engines produce 300 hp and 300 lb-ft of torque), BMW says the new engine will offer "better throttle response and even more fuel.
The new six-cylinder (N55 designation) develops maximum output of 300 hp at 5,800 rpm, with peak torque of 300 lb-ft available all the way from 1,200–5,000 rpm. This is the same level of performance as the current 3.0-liter twin-turbo six-cylinder but with the innovation of twin-scroll technology and the integration of VALVETRONIC throttle-less intake technology.
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