I would say about 3.25 or 3.5 to one,unless you are using slicks or something. I put in 3.89 to one in my car when I thought I was going to put in an automatic.I put in a five speed instead, and with the 3.27 to one first gear it is hard to leave hard without blowing away the tires.If your car is stock then first gear times rear is probably something like six to one.With a five speed and the same rear gears it would already be more like nine to one. Thats about fifty percent more without changing the rear. If you try that first and decide that its not quick enough off the line, then add more rear gear(3.5 or 3.25). Don't do what I did by changing both at once, all you'll do is make first gear useless.