[scooby doo]

The box braces people say don’t work either .
6speed is the best option I’ve heard stronger than a Ppg gear set,
The hawkeye box could be a good fair price option as a lot of guys with mapped wrx hawks pulling big torque and showing the box holding up to it.

Ppg gear sets start from last time i looked 2k plus fitting .
6speed some allow use of your rear diff and you can use your clutch and flywheel if new ish so can be done for around £1500 which isn’t to bad for further proofing
Worth noting to buy the later blob onwards for better synchros the very easily ones have a weaker set so eventually start to
Catch at high rpm especially going into 4th. My bugeye Sti had to be done