RIDGE RACER
I can't tell you much of anything new that hasn't been said in all the other Ridge Racer pages. Destroy all the alien ships in the opening "Galaga" game to have access to all 13 cars instead of the default 4. Drive out to the end of the gate, turn around, and charge the barrier to play a mirror-image game. Get first place in all 4 original races to get the 4 extra tracks, which are the original 4 driven in the opposite direction but with less time available. Beat the black lamborghini in time trial mode to make it available for driving. There are no known cheat codes (other than maybe Game shark, which I won't go in to).
For general racing, I have found the best car to be second from the left; it has the best handling.
For beating the black lamborghini, the best car I found for that is the orange-yellow-blue Dig-Dug car; it has a faster speed and only slightly decreased handling over the previously mentioned car. (Let me check on this, I think that's the right car)
BIG-ASS JUMP: Get the extra tracks; go to time trial extra. Drive either the yello or black lamborghini. Just beyond the standard finish line (of the regular tracks) is a hill. This hill looks pretty tame to start out, but you will get HUGE AIR!
FOR MORE FUN: (Works best with the yellow lamborghini). Take that big jump, but hug the wall on either side. Just before you get to the top of the jump, release the accelerator, turn away from the wall, and press the gas again while still holding the direction button (this will enter a slide). You start to spin right when you hit the jump, and you will do a 360 in mid-air! It is so cool!