My '99 G20 has about 45k miles on it, but I have this bad, lazy habit of leaving the clutch near its friction point at signals, hills, etc. Plus, my friends and I abused it quite a bit. So, my clutch is already starting to slip a lot. I have a new clutch disc sitting at home, but all the mechanics I've asked say that I should replace the fly wheel too. I'm thinking the car's still fairly new and that only the disc needs replacing. What do you guys think?