History GameBreaker / Forza

** Update 6 added a drift transmission as a new upgrade for all cars in the Tuning Shop. Even though it is clearly meant for drift builds, it gained unlikely usage through GoodBadBugs on two cars in particular: the RAESR Tachyon Speed and the Jaguar I-Pace. The former in particular became extremely infamous as the default gear ratios for the drift transmission, when installed in the Tachyon, reduced the car's top speed from 390 kph all the way down to a mere 32 kph, which in turn tanks the car's PI rating like a rock from [=S2=] all the way to the middle of ''A-class''. The car's original top speed could then be restored by adjusting the gear ratios. Predictably, this completely broke A-class road racing in a way that the Bone Shaker could only dream of, as it was akin to bringing a hydrogen bomb to a knife fight. Playground addressed the issue by temporarily stopping A-class Horizon Open races and banning the Tachyon from online races and Rivals, but time will tell whether this bug will be fixed or not.

** The Hot Wheels Bone Shaker returns from ''Horizon 4'', and so too does its dominance in A-class road racing. Unlike in the prior game, though, it is once again available for use in Horizon Open. General improvements to A-class cars overall mean it isn't at the same overwhelmingly broken level it was in the last game[[note]]Examples of cars that really give it a run for its money in A-class include the Nissan Skyline GT-R [=R34=], the Honda NSX-R GT and the [[BribingYourWayToVictory Car Pass-only]] Subaru WRX STI [=S209=] for Road racing; the Bone Shaker is also dominant in Dirt racing, but is outgunned by the Mercedes-Benz X-Class, International Scout [=800A=] and Toyota Tacoma TRD Pro in Cross Country.[[/note]], but it is very close to it; it's still plenty capable of carrying a mediocre driver to high placings, and a skilled driver far ahead of the pack. Not only that, unlike with ''4'', it's also readily available for everyone to purchase in the Autoshow.

** The Lamborghini Sesto Elemento Forza Edition has quickly gained infamy as the absolute best car in the entire game if fully upgraded. It may not reach the speeds of a Jesko or a Chiron, but what really elevates this car into Game-Breaker territory is its insane handling, almost feeling like you're driving on rails. Not only that, it also has a Skills Boost by virtue of being a Forza Edition car, making it a great choice to grind for Skill Points as well.

** The Hot Wheels Bone Shaker returns from ''Horizon 4'', and so too does its dominance in A-class road racing. Unlike in the prior game, though, it is once again available for use in Horizon Open. General improvements to A-class cars overall mean it isn't at the same overwhelmingly broken level it was in the last game[[note]]Examples of cars that really give it a run for its money in A-class include the Nissan Skyline GT-R [=R34=], the Honda NSX-R GT and the [[BribingYourWayToVictory Car Pass-only]] Subaru WRX STI [=S209=] for Road racing; the Bone Shaker is also dominant in Dirt racing, but is outgunned by the Mercedes-Benz X-Class and the Toyota Tacoma TRD Pro in Cross Country.[[/note]], but it is very close to it; it's still plenty capable of carrying a mediocre driver to high placings, and a skilled driver far ahead of the pack. Not only that, unlike with ''4'', it's also readily available for everyone to purchase in the Autoshow.

** The Hot Wheels Bone Shaker returns from ''Horizon 4'', and so too does its dominance in A-class road racing. Unlike in the prior game, though, it is once again available for use in Horizon Open. General improvements to A-class cars overall mean it isn't at the same overwhelmingly broken level it was in the last game[[note]]Examples of cars that really give it a run for its money in A-class include the Nissan Skyline GT-R [=R34=], the Honda NSX-R GT and the [[BribingYourWayToVictory Car Pass-only]] Subaru WRX STI [=S209=][[/note]], but it is very close to it; it's still plenty capable of carrying a mediocre driver to high placings, and a skilled driver far ahead of the pack. Not only that, unlike with ''4'', it's also readily available for everyone to purchase in the Autoshow.

** The Hot Wheels Bone Shaker returns from ''Horizon 4'', and so too does its dominance in A-class road racing. Unlike in the prior game, though, it is once again available for use in Horizon Open. General improvements to A-class cars overall mean it isn't at the same overwhelmingly broken level it was in the last game[[note]]Examples of cars that really give it a run for its money in A-class include the Nissan Skyline GT-R [=R34=], the Honda NSX-R GT and the [[BribingYourWayToVictory Car Pass-only]] Subaru WRX STI [=S209=][[/note]], but it is very close to it; still plenty capable of carrying a mediocre driver to high placings, and a skilled driver far ahead of the pack.