V8 in the E90 M3. These are the most powerful engines BMW has ever built (not including the BMW S70/2) without supercharging or turbocharging, with an output of 100 hp per liter of displacement, and each has won numerous International Engine of the Year Awards. As late as the early 2000s, BMW regarded forced-induction (supercharging or turbocharging) as low-tech shortcuts to boosting horsepower, stating that this adds weight and complexity while reducing throttle response. BMW purists have noted that while forced induction and/or large displacement does produce more torque for better day-to-day driving, most of them like the "character" and sound of low displacement naturally aspirated engines with high redlines. However, the late 2000s international regulations trends on reducing emissions and fuel consumption are cited as the reasons not to continue further development on naturally aspirated high redline engines. The N54 twin-turbo inline-6 which debuted in the 2007 BMW 335i (E90) gives almost equivalent performance to the E46 and E90 iterations of the BMW M3, while being much more practical and fuel-efficient as a daily driver. Starting with the X5 M and X6 M, and featured in the F10 M5, BMW used the twin-turbocharged S63 which not only produces more horsepower and torque, but is also more efficient than the S85 V10. Also unlike the S85 and S65 which do not share a design with non-M BMW engines, the S63 has significant parts commonality with the base N63 V8 engine (which is also has twin turbochargers) making them less expensive to build. BMW has not yet considered supercharging. From 2013, the BMW M3 (E92/E93) is the only "traditional" M car left, as the rest of the list features turbocharged engines, and the next iteration of the M3 (F80) and M4 (F82/F83) features a twin-turbocharged straight-6 engine. M cars versus M-badged cars Apart from the pinnacle M versions of each model, BMW Motorsport also offers "M Sport" accessories upgrades to cars in its lineup. This single purchase option, which is superior to the standard Sports Package, includes a more sporty suspension, sports steering wheel and gearshift, fully-adjustable sport seats, sports wheels and a sports aerodynamic package. Cars with the "M Sport" option, while not being the pinnacle M model of each series are considerably sportier than the stock model. Vehicles with the "M Sport" upgrade feature smaller M badges on the wheels, front fenders, steering wheel, gearshift and door sills, whilst