Len @ Subaru4You ( Newbury ) for your specialist...
Subaru4you - an alternative to main dealers
Tuning on a MY94 will mean a replacement ecu ( Apexi is about the most cost-effective ) or a scoobyecu daughter board, but I know little about them...
Pm Simon ( Jolly Green Monster ) on here for his prices as he's at least at the right end of the country...
HTH
Steve