It includes a 2.0 TFSI engine rated and torque, six-gear manual quattro drivetrain. These riders must brake entirely through the drivetrain. The #8 was receiving repairs to its front axle drivetrain. Cobra featured an uprated P&WC T400-WV-402 engine and stronger drivetrain. The hybrid Corolla drivetrain is mechanically almost identical to the Prius. A hybrid bus can also deliver fuel economy though through the hybrid drivetrain. They then replaced the stock engine and drivetrain with SHO drivetrain. Modifications were also made to the engine, undercarriage, drivetrain, and sound system. The fiberglass bodied "pushmobile" concept has no interior, engine, drivetrain, or suspension. Together these technologies increase fuel economy to a level similar to a hybrid drivetrain. It is now also offered with a hybrid drivetrain. This forms the basis of an Atkinson cycle-based hybrid electric drivetrain. This arrangement is known as a series hybrid drivetrain. The ECC clutch is pulsed during turns to avoid the system from binding the drivetrain. The "Activehybrid 7" was the first BMW vehicle to use a hybrid drivetrain.