Well a few things that I've noticed about the Speed 12 is that first, it's traction and weight tranfer are much different than other supercars. It's much lighter than most of the others and is a bit more powerful than the average supercar. Meaning that when you hit the gas, you'll be spinning those preety little Super Soft tires to the bone. One funny thing about an unmodded Speed 12 is that it'll keep burning out in 3rd gear, going at about 80 mph.
If you have the patiance, get the thing lightened, get the stability controller, and the traction control system, then get some good shocks and breaks.
Tweak the shocks to get it as low as possiable and as fairly tough. Have the traction contol up and the stability up. Then put the racing mod on there and put the downforce down on that baby. Do anything possiable to make the thing stay on the ground. Yes you will lose a bit of speed but the thing has so much power that it's new setup will be more than enough to get you out of corners at faster speeds than the Dukes of Hazard through the back trails of Tenessee.
The Speed 12 will spin out no matter what you do, you just have to know how powerful the steering is on the car, since if you try to pull it back at full power your just gonna end up spinning the opposite direction. Just make sure you lightly apply steering and hit the break BEFORE starting your turn. Meaning when you enter a corner you'd most likely wanna do somthing like this
stay outside, break hard, downshift, downshift, turn, apex as close as possiable without going over the rumble strips, gas, upshift, upshift, straighten out, prepair for stright/corner
Also the Speed 12 has a bad habit of being a bit shakey when hit by a wall or another car. Try to use this for good. Stay to the inside of other cars and use the S12's bad habit to bounce yourself incloser to the inside of a turn while keeping your speed up. Note that you'll never be able to do a wall ride and be able to come out good, you'll most likely spin out right after you exit.
If any of this was useful or it was all just repeditive ramble whatever. That's my thoughts. Later