B Best cars for Road Racing - B class
[1965] Shelby - Cobra Daytona Coupé
This car performs best in A class but if you can buy more than one, it is worth to have one in B class. It is a really nice car, available to buy at the auctions and Autoshow. Very good speed, acceleration and insane grip. Get tune with high suspension and you will have the ideal car for other types of races. But it's better to have many of them with different tunings.
[1990] Subaru - Legacy RS
Good car for a good price - 25.000CR in Autoshow.
A Best cars for Road Racing - A class
[1965] Shelby - Cobra Daytona Coupé
You can't go wrong with this one. It's one of the best cars you can get! It can be bought on auction and from Autoshow. It's not so cheap, but this car is worth every penny. Very good speed, acceleration and insane grip.
[1959] Plymouth - Atomic Punk Bubbletop
This car is from Barrett-Jackson Car Pack and it's impossible to get this car without it. This addon is included in Forza Horizon 4 Car Pass, which is available as a standalone and with Forza Horizon 4 Ultimate. Really good car in A class for every type of Road Racing and every type of weather.
[1969] Chevrolet - Nova Super Sport 396 Forza Edition
Very popular car in this class. Not available from Autoshow. It can be bought on auctions and with a little luck you can win it from a wheel spin.
[1965] Alfa Romeo - Giulia TZ2
It is a cheap version of the Cobra Daytona but still a great car! It cost less so it's easy to get at the auction and it is a good car for all types of weather and every season.
[2002] Lotus - Esprit V8
Not so popular, but with good tuning it can be a really nice car. Really fast and good on the corners.
S1 Best cars for Road Racing - S1 class
[2005] Ford - GT
Amazing speed and grip makes the Ford GT one of the best cars in S1 class. Great for all types of weather and it can be used during winter with additional tuning. It can be purchased from Autoshow for 300.000CR and on auctions.
[1992] Bugatti EB110 Super sport
A really good car, available in Autoshow, auctions and was available as a reward during season 17 for the "Millenial Cup" race. We know that after Update 37 the old seasons will be randomly mixed, so it will be possible to get it for free.
[2018] ATS - GT
The best car for every weather with amazing grip. Amazing in winter if tuned with winter tires. Really hard to get, check the auction house from time to time. ATS GT is a rare car, and you could have won it in season 16, 19, 25, 27, and 32.
[1997] Lotus - Elise GT1
This car has a low maximum speed, but grip is insane! So it is one of the best cars for short tracks with lots of turns, like city roads and festival circuit. Part of Barn Finds, it can be found close to the Slate Quarry.
[2018] KTM - X-BOW GT4
Another car with really good grip, but pretty slow. Really good on short tracks where you don't have too much time to get maximum speed. You can buy it on auctions. Was available as a reward in a few previous seasons: 10,16 and 21.
S2 Best cars for Road Racing - S2 class
[1996] Ferrari - F50 GT
Fast beast for S2 class, not an easy car to drive but it's worth to try. Best for good weather and dry roads. Available in Autoshow for 1.200.000CR and can be obtained through an Auction house. This car is also included in the Welcome Pack DLC.
[2008] Koenigsegg - CCGT
Great car for every weather, but most popular for dry road. With good tune can be also used for dirt racing. Can not be purchased from the Autoshop, but you can find it on Auction House. Available in seasons 15,25 and 34 as reward, and could be bough in few seasons from Forzathon Shop
[2019] Bugatti - Divo
Good handling and speed. Really nice car for dry and wet road.
[1987] Ferrari - F40 Competizione
Ferrari F40 Competizione can be purchased from the Auto Show and Auction house.
[1987] Lego Speed Champions - Ferrari F40 Competizione
Ferrari F40 Competizione can be obtained from Lego DLC as alternate Lego version.
[2014] Porsche - 918 Spyder
A good compromise between speed and maneuverability. Porsche 918 can be purchased on auction or from the Autoshow.
[2013] Lamborghini - Veneno
Good grip, with good tune can be really good for winter and street racing. Veneno can be purchased from Autoshow and through an Auction House. Reward from 18,34 and 37 serie.