Last night i was driving down the street and i was in second gear, not driving hard at all, and my tranny started making a loud rattling/grinding sound, popped out of second gear, and after that i couldn't shift into any gears but first. Could someone help me out with what may be wrong ASAP as it is sitting in a parking lot as i type this up. I should also add the fact that its a 99 impreza with a stage III Clutchmaster, bolt on turbo, and pushes 300+hp. Any ideas from anyone and maybe some kind of idea what this is going to cost me? Also, I've never had any kind of problems with this car and i VERY RARELY drive it hard and never slam gears. Please help!