15: Limited Slip Differential
Do you ever notice when you do a donut that only one of the wheels is spinning? Probably not, but for those of us in the car business that your differential. Thus, a lot of people are opting to purchase a limited-slip differential. The thing is that for the average driver you aren’t going to need this often heinously expensive upgrade. Most anything that has to do with the rear end of the vehicle is going to cost a great bit of money.
Getting the performance from this aspect of the vehicle is just useless and expensive. You aren’t going to be taking most vehicles out on the track, and naturally, that means that you aren’t going to get a whole lot of performance increases.