I don’t think modified cars count because then you are not driving the base car.
Anyway at the moment I’m having a lot of fun in the Lancia Fulvia. This car might not have the best PI count but it will beat the more powerful (and heavier) cars because it is VERY light and oh so nimble. So much fun to catch the big boys one by one and leave them in the dust. Also I can’t wait to try out the Super20 which is waiting in my garage 
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My favourite so far: the Honda RA300 F1 car.
I really like the factory racers division. I havent got the f40c yet, but it was a fav in the past forza it was in. Really liking the porsche stratteversion and the f50gt. That 1.5mil super indy car is great fun
I love racing Caterham or other track day cars.
I generally don’t like Ferrari’s but I’ve been racing with the 360 Challenge Stradale and it hugs the road! Probably one of my new favorite A-Class cars.
This car has been an A class favorite for many versions of Forza. It’s light Nimble, very tunable, perfect performance in its class. Fun and easy to drive, I always grab one of these and tune it up early. In fact I have to really make myself Drive other cars once I’m in A class cuz I just want to drive this thing. Luckily with the new homologation system, it’s forced me to drive a bunch of other A class vehicles. And that’s the reason I find this new system so terrific.
The GT3 cars all seem fun. BMW Z4 GTE with a little bit of a custom tune it’s got so much turn in and amazing traction. It also sounds great like a bunch of the GT3 class cars. They have limited top end but a few can be tuned to have sweet balance, the most important thing I look for in a car.
Even if it’s not extremely powerful or fast but has good handling balance then it’s a joy. One of my all time Forza faves is right up there again, Ferrari F355. It looks amazing, it sounds amazing, and with a little fettling it still handles like a dream
Fun to drive you ask well if its just strait out fun then it is the Ram Runner FE Maxed out with springs fully lowered and stiffened to 90% with Sway Bars at 50% for front and 98% rear then practice going arround corners on 2 wheels only Tune is Shared just search my GT Alan J T
Car is a blast to drive when you just want to have some gold old fun.
Renault rs 17. It will put a garunteed smile on your face if you’re not afraid of speed. Give it a try
Cannot remember the most fun car but the car that was the most terrifying to drive was the 2015 Ultima Evolution Coupe 1020. It was fun in the same sense if you consider walking on a tightrope between two skyscrapers fun.
This reminds me when my neighbor decided to swap his 1000cc Kawasaki Ninja engine into his little go-kart. It’s still a mystery how that guy is alive. Insanity can be fun, at least if you’re just watching LOL!
That Ultima has so much power… The traction control needs traction control
The FF Plymouth Gtx is fun.
Holy cow you aren’t kidding. I threw a quick drag tune on it and was able to run sub 8 second quarter miles within about 5 minutes of effort. Now I’m working on getting sub 11 second half mile. What a nuclear missile this thing is
I’d like to add the Audi #2 S1 for pure point and squirt funness. Grip is incredible and so easy to push on the limits. Drive it!
1990 Ferrari #1 Scuderia Ferrari 641
Driving this thing is just insane fun with no assists.
The Ford Ute, you turn this thing as much with the throttle as the wheel.
Porsche 918 - stock setup is sublime, I set the 16th fastest time in Europe on Watkins Glen this morning using it. Carry a bit too much speed into a corner and the back steps out in a really controllable fashion, you can four wheel drift it like a monster. But if you’re not quite making the apex and you boot the throttle it behaves like a RWD car and kicks the back out. It’s just magical. MAGICAL!!!1111!¬!!!£243219580405923869034870tyigwdkslfgms eklyjer
I’m more of a ‘drive a slow car fast’ type, so my vote goes to the 1984 Mugen CRX. Super nimble, on-the-gas 90% of the time and generally a very go-kart like experience. Took it out on VIR South Course (one of the Rivals events) and taking the left-right-left of the Spiral is super fun in the CRX
Honestly, since FM5 (my starting spot) my favorite non-Porsche has been the old Datsun 510.
Yep, that in a fly red white and blue racing livery really gets me going. I think it’s that whole “race what ya brung” attitude.
…or the 2014 Porsche Turbo S. I just LOVE this car.
So conflicted.