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All F1 cars have a moveable flap on the rear spoiler. DRS - drag reduction system. There is a DRS detection zone, usually a turn or two before the main straight. If you are within one second of the car ahead of you when you pass this detection zone, your DRS will be enabled for the DRS zone - usually the last half of the main straight. A car with DRS activated typically has a 20-30 km/h advantage by the end of the straight. It is a way to encourage passing. This is the ONLY active aero mod allowed in F1.
Another cool F1 feature is KERS - kinetic energy recovery system. All cars have regenerative braking that charges a battery pack to a maximum capacity of 400 KJ with a maximum output of 80 hp. This equates to a maximum of 6.67 seconds of boost per lap. Drivers use it strategically to gain time here and there around the track, or to fend off a DRS enabled car attempting to get around them.
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