I sometimes almost autocross around town and I'm wondering if it's bad for our car. I'm always upshifting and downshifting constantly when I start driving like this. I don't speed and I don't take corners insanely fast but I usually downshift into a corner and punch it out the corner pretty fast. I have a SS and I downshift on the freeway all the time to pass. I get bored and I just start driving a different way for fun. Sometimes I worry though what it might be doing to my car.