could be the clutches in your transmission. happens alot on automatic transmissions. could get a transmission master rebuild kit for around 100.00 on ebay.
if its standard, could be your synchros
1st and 4th gear synchronizers when out on my stock transmission it is common
Looking for a Used Impreza in your area?
CarGurus has 20,701 nationwide Impreza listings starting at $1,995.
Search Subaru Impreza Questions
Subaru Impreza Experts
Related Models For Sale
Used Cars For Sale