The engine itself is identical to the one in the Evo, right down to the 86mm-by-86mm bore and stroke, semi-closed-deck block and forged crankshaft and pistons.

Mitsubishi Press Release:

The new-for-2009 Mitsubishi Lancer Ralliart is based on the Lancer GTS platform, adopting powertrain and 4-wheel drive technology from the Lancer Evolution. The result is a unique model optimized for exhilarating yet balanced overall road performance. The Lancer Ralliart gets a modified version of the Lancer Evolution 4B11 T/C turbocharged/intercooled 2.0-liter DOHC MIVEC engine, teamed with the Twin Clutch-Sportronic Shift Transmission (TC-SST) from the Evolution MR model.

The 4B11 T/C is an intercooled-turbocharged 2.0-liter DOHC inline four-cylinder engine built with a cast-aluminum cylinder block and cylinder head. Although based on the architecture as the 4B11 naturally aspirated engine, the 4B11 T/C starts with a unique semi-closed deck block casting and is reinforced for turbocharging. Likewise, the internal components are reinforced to withstand high levels of boost. An integrated die-cast ladder frame contributes to engine block strength and also helps reduce noise, vibration and harshness (NVH) levels. High internal rigidity helps ensure smoothness, and so the 4B11 does not use a balancer shaft.