i am a beginner at tuneing up cars and i need help i dont know what i am doing so any pointers or a guide of soemsort would b nice and i was wondering is it better to put all the drivetrain stuff in cars like the limited slip stuff i am wondering becuz i got it in one car and the car goes slower maybe i just need a tuneing guide so i know what i am doing well thanks for any advice o yea is there like a site or soemting i can go to that has a guide that teaches how to tune up the cars