Just bought an 04 WRX with 6K on the clock, and had a Prodrive back box fitted for the awesome sound!!!

I've been grinning like a mad man for 3 days solid now and now understand why everyone raves about the Impreza's soooo much

There is a slight problem though when I up change from 4th to 5th gear at 80mph+. No matter how fast or slow I change gear I get a tiny grating noise as if the very tips of the syncro are just catching on the tips as they engage.

Its not a major crunch like you get with a bad gear change, does anyone have any ideas before I go back to the dealer???

Cheers!!

EDIT
No need to reply just found LOADS of threads relating the same problem