I have my s/o valve bypassed permanently on my '84, but I have also confirmed proper wastegate operation (and experimented with disconnecting the wastegate as well!) to see what the results would be. I feel fairly certain that my engine won't overboost itself & cause damage. I don't recommend others do this though. The valve is part number 001-540-86-97, about $25 on online suppliers, if you can't clean yours out (or if it's functionally broken).
