don't hit the brakes in a turn in the SRT-4 unless you KNOW what is going to happen and are trying to do it on purpose (like at a track).
This car has lift-throttle oversteer, meaing that when you lift off the gas the weight transfers to the front of the car making the back end light. This added weight on the front tires causes them to have more available grip due to added friction. The back tires with less weight will begin to slide if you are in a turn and lift off the gas while being close to the grip limit before you lifted. If you have this happen to you the BEST way to correct is to NOT get on the brakes (which causes more weight on the fronts, increasing the speed the back end will come around). Steer into the spin some. Also feeding in a little bit of gas while holding the steering constant will shift some weight back to the rear tires hopefully giving them more grip and you will stop sliding/spinning.
I have not noticed the rear end drifting out in fast turns as long as you know how to set up. Be smooth with ANY inputs (steering, gas, brakes) and you will will have a fairly neutral handling car. If you jerk the wheel or nail the brakes or gas in the middle of the turn or at turn-in then you upset the balance of the car making it do things like spin or understeer.
My best advice is to find a local autocross organization (probably SCCA
www.scca.org) and pay the ~$20 to find out what happens to your car when at the limits, yours and the cars. Since you are under 18 you would need to have both parents/gaurdians show up and sign a release waiver saying you can run. Autocross speeds VERY rairly excede 60mph but at these slower speeds if you start spinning all you will hurt is your tires and the poor cones you will knock over. I can attribute the lack of wrecks I have had in my 6 years of driving to the autocrossing I did as soon as I got my license. My dad took me out to the events and even though I wasn't truely competitive until two years ago I was able to learn what the car did when I nailed the brakes in a turn, or was approaching a turn too fast and needed to hit the brakes and steer through the turn. Also I learned how to save the car if I started to spin. In my old car it was countersteer and hit the gas. In the old honda it was twitch the steering very quickly into the turn and then feed in the gas a little bit. In the SRT with air pressures I run at I have yet to spin because I could feel the back end coming around and steered into it and let off of the gas or brakes, whichever I was on at that instant. This allowed the car to regain grip and then I could continue on my way safely.
keep all driving at the limits to the track, especially until you get more experience with the car and with driving in general. Sunday's are the only days I squeel tires in turns.