Now this post will server to state my opinion but I also hope this can help some people.
(Disclaimer: The cars listed will be free cars meaning they don’t require vip and are not a limited or archived vehicle. Reward vehicles that are earned through missions or achievements do count as free.)
Additional note: The best spoiler should be used when possible but spoilers like the bat wing, christmas spoilers or spring spoiler can be used to. On some cars these limited spoilers can actually be better than the free best spoiler.
F class: Volkswagen Beetle
Overall this car is pretty much the go to for F class races it handles well and is decently fast for this class. The upgrades you should have installed for best F class performance are motor cooling, cams & valves, weight distribution and racing brakes.
E class: Honda EG Civic
This car performs a bit better than most stuff in the E class it has decent acceleration and top speed. Now the best upgrades for this to remain in E class are weight distribution and racing brakes.
D class: Bugatti Type 57C Atlantic
This car is probably the only good free D class car due to its top speed and acceleration. You should aim to use a better spoiler over acceleration upgrades and with this car you can use the spring or bat wing spoiler without it being pushed into C class. However if you want acceleration then the best upgrade to use is Motor cooling, additionally this car’s top speed can be pushed pretty high to around 153 mph in D class the ratio for this is 81%.
C class: Porsche 911E
This car is probably one of the best free C class vehicles in the game currently, it has sub par acceleration but it makes up for that with its exceptionally good handling especially at high speeds this car can take turns nearly at its highest tuned top speed of 247 mph making this not only good for circuits but also an excellent car for atw and island circuit. For it to remain C class in stock gearing it must not have no upgrades or even a spoiler, however if you push up the top speed to max you can get away with having the best spoiler and racing brakes but that’s it.
B class: Ferrari F355 F1
This car used to be the best free car for both B and A class however something new has been added in A class that beats in every aspect but that doesn’t mean it still can’t be used for B class though. The stats are pretty good for B class the main standing point about this car is its handling it can handle at over 220 mph making this pretty good for atw and in stock gearing it still is a pretty good choice for circuit tracks, the other big advantage this car has is it’s acceleration while the 911E maxed out is A class and can be in B class this car has better acceleration although it should be noted the 911E still out does this car on atw or any speed based races due to its slightly better high speed handling and overall top speed. For best upgrades to have you should use race brakes, engine block and cams & valves for optimal B class acceleration, for best upgrades to use when fully tuned for top speed you should use the previous upgrades listed alongside exhaust, pistons and ignition.
A class: Saleen S7
Before its remodel the Saleen was pretty crap but after its now one of the best if not the best A class car even competing with limited metas like the mc12. No upgrades or spoilers should be installed for it to remain A class additionally you cannot tune the top speed at all or else it’ll be put in S class. Overall this car’s acceleration, top speed and handling are some of the best within the A class it can turn at it’s top speed decently well and will destroy circuit tracks. I should also note this could be a solid choice for S class especially in speed races where the better spoiler allows it to carry the higher top speeds better around turns.
S class: Lamborghini Revuelto
This by far is one of the best S class vehicles hand down with its only rival being the W1 a limited car and potentially the S7 but where this car really beats all other S class is the acceleration and handling maxing it out completely is the best way to get the most out of it since it never goes into X class. You can tune it to 95% to have slightly higher top speed where it might benefit you and even at its max tuned speed of 300 mph it’ll carry almost 250 mph through turns.
X class: Ferrari Xezri
Now many of you may scream at me about the F1 cars, F80 or even the mx30 and while before this was added I would have put the mx30 or f80 this car has combined handling that not only handles circuits better than the mx30 but handles at high speeds like the f80 while accelerating faster than both cars and even keeping up with the f1 car’s insane power to weight acceleration, in turn making this car the best all rounded X class car. For upgrades maxing this out fully and getting the best spoiler is what you should do.
