BMW M4 Competition vs Mercedes-Benz AMG E 63

Power dictates the performance of an engine. It's measured in horsepower (bhp) or metric horsepower (PS). More is better.

The load-carrying ability of an engine, measured in Newton-metres (Nm) or pound-foot (lb-ft). More is better.

Valves let air and fuel into the cylinders of a combustion engine. More valves typically make more power and are more efficient.

A device that forces more air into an internal combustion engine. More air can burn more fuel and make more power. Turbochargers utilise exhaust gas energy to make more power.

The distance from the centre of the left tyre to the centre of the right tyre of a four-wheeler's front wheels. Also known as front track. The relation between the front and rear tread/track numbers decides a cars stability.

The distance from the centre of the left tyre to the centre of the right tyre of a fourwheeler's rear wheels. Also known as Rear Track. The relation between the front and rear Tread/Track numbers dictates a cars stability

It is the weight of just a car, including fluids such as engine oil, coolant and brake fluid, combined with a fuel tank that is filled to 90 percent capacity.

The gross weight of a car is the maximum weight that a car can carry which includes the weight of the car itself, the weight of the passengers, and the weight of any cargo that is being carried. Overloading a car is unsafe as it effects handling and could also damage components like the suspension.

Rear headroom in a car is the vertical distance between the center of the rear seat cushion and the roof of the car, measured at the tallest point

Rear legroom in a car is the distance between the front seat backrests and the rear seat backrests. The more legroom the more comfortable the seats.

Front headroom in a car is the vertical distance between the centre of the front seat cushion and the roof of the car, measured at the tallest point. Important for taller occupants. More is again better

The distance from the front footwell to the base of the front seatback. More leg room means more comfort for front passengers

Some cars have buttons on the key to unlock only the trunk/boot of the car without unlocking any of the doors.

It refers to a storage compartment built into the dashboard of a vehicle on the passenger's side. It is used to store vehicle documents, and first aid kit among others.

Refers to a display that shows the current time in a digital (numerical) format.

Power-adjustable exterior rear view mirror is a type of outside rear view mirror that can be adjusted electrically by the driver using a switch or buttons.

It refers to a vehicle's mirrors opening and closing at the touch of a button.

Refers to water jets that clean the headlights. This is beneficial when driving in the rain, or in muddy conditions.

It refers to a water/moisture sensor that automatically starts the wiper when it rains or water is splashed onto the car's windshield. It is a feature that aids both convenience and safety.

It is a single wiper used to clear the rear windshield of dust and water. It can be used by itself or with a washer that sprays water.

It is the sprayer/water dispenser located near the rear windshield that works with the rear wiper to clean the glass.

Rear window defoggers use heat to increase the temperature of the rear windshield to clear any fogging up of the glass caused by weather conditions.

Refers to lightweight wheels made of metals such as aluminium. Available in multiple designs, they are used to enhance the look of a vehicle.

Tinted glass refers to a coating or film applied to a car's glass area that either reflects heat from entering the cabin or improves privacy for those inside the car by reducing visibility from outside, or both.

A rear spoiler is used to increase downforce on the rear end of the vehicle. In most cars however, they're used simply for looks.

A sunroof is a glass panel on the roof of the vehicle. It can either be just over the front seats or extend further backward towards the rear.

Side steppers are a convenience feature, usually offered in vehicles with high floors, to make it easier to step into or out of the car. They are either pemanently fixed near the side of the vehicle or deploy electrically. The latter is usually only with luxury cars.

It refers to a shiny silver finish on the grille of a vehicle.

Chrome garnish is a chrome strip or panel applied to certain parts of the car to make them look brighter or flashier.

Cars with dual-tone body colours have two paint colours applied, usually where one colour is used heavily while the other is a contrast applied only to parts like the roof and outside mirrors.

Roof rails are parts attached to a car's roof that can either enhance a car's styling or be used to carry luggage carriers. Not all roof rails are designed to take loads and if they are, they have strict weight limits.

Heated wing mirrors can also be called mirror defoggers. As the name says, using heat, the outside rear view mirrors can be cleared from fogging up during cold/rainy weather, improving rearward visibility and safety.

LED daytime running lights (DRL) are not to be confused with headlights. The intended purpose is to help other road users see your vehicle better while adding to the car's style.

Refers to the use of LED lighting in the main headlamp. LEDs provide a bright white beam, making night driving safer.

Refers to the use of LED lighting in the taillamps.

Refers to the use of LED lighting in the fog lamp. A fog lamp is placed low on the bumper to help illuminate the road and surrounding area enhancing safety in foggy/rainy conditions.

Car headlamps automatically turn on in low light conditions, and switch off in bright conditions.