Harsh noise isn't specific enough. If it has a rattling sound, or metal "slapping" sound at start and then goes away, than it's the timing chain tensioner. If this is the case, don't worry, it happens to almost every SR20DE owner. If it's a whining sound or grinding WHILE starting than most likely it's the starter.
[This message has been edited by niska (edited 07-26-2001).]