I'm a newbie, so i'm not sure if this is normal; espcially for a 2003 model. Every time i would change gear fast, i would get a horrible grinding noise. This is eliminated if i change gear slowly and work the clutch slowly...But there's times that you needs to change your gear fast ... Any recommendation for this?

 

Not knowing your driving experience (except for what you posted in the other thread about hardly ever going into VTEC and how you find it hard to handle when you do rev it), I would guess that you need to practice your clutch/throttle/shifting technique more to get better at it. To be more certain of this, I would suggest you find another experienced S2000 owner/driver in your area (maybe in your regional forum on this site) to drive your car in a spirited manner. Then you'll know for sure.