Hey you guys, I think everyone should take into account my story.
You see, I really spent a lot of time with the various game versions of the S2000.
Mugen S2000
Maxed out power and lightweight stage 2.
380hp @ 8400 rpm
1103 kg
2.902 pwr
.339 twr
Spoon S2000
Semi-tuned power, no lightweights availible for car.
380hp @ 9100 rpm
1100 kg
2.894 pwr
.360 twr
This the result of some research...
Turns out, the S2000, in all forms (beside the s2000 lm) can run at *1100kg.
With this in mind, I think the S2000s in the game may have an 1100kg race in mind.
Look at the way the mugen hits literally with in .008 of the spoon's pwr, yet has a .021 twr advantage. (btw, the spoon racecar is right on with these, but slower.

)
Also look at the hp peak rpm range. The spoon runs higher but has less torque, the mugen runs lower and has more torque.
I think this is a challenge born to run, but I just haven't had the time to fit it into the weekly race.
For sure though, this is definately a great run... the normal s2000 can hit almost the exact same specs as the above cars too. 1103kg for a normal S2000.
The mugen is actually one of my favorites, it's just too bad the hp can't go as high as the spoon's can. (spoon can go to 444hp where as the mugen tops out at 380hp.)
Enjoy this challenge if you can, it's great fun.
Later.