For the fun factor, the 2J will not disappoint. It only has 3 gears, which means you won't be shifting as often, but has just as much acceleration as any LMP car with over 1000 horsepower. There is no adjustable downforce, so cornering at high speeds is iffy but, for corners under 130, it will take as hard as any maxed downforce car. The lack of downforce is also a blessing as well as it doesn't limit the top end of the car.
The worst part of the car is the transmission, really. Adjusting the 3 gears leaves large gaps between shifts, so it doesn't stay in the powerband as much as the 6 & 7 speed racecars, but has no problem getting to 200MPH in no time flat. The 2D racecar is very similar to the 2J, lighter but only 785hp, it is very impressive for also having a 3 speed transmission and without the vacuum suspension of the 2J. I would suggest both if you're looking to get away from the ordinary LMPs and giving yourself a challenge. The 2D also has adjustable downforce & headlights, so you can use it in the 24 minute races.