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Randomly found a video on the 5 speed and the guy in he USA who rebuilt 1000’s says the gear break as they are too thin for increased torque. the 2014 6 speed from the WRX is apparently basically a 5 speed sized gear and breaks the same. they replace the gear sets and have little to no issues. so stronger gear material is worth it compared to rebuilds or replacing the gearbox over and over.

I broke one 5spd gearbox in about 7 years of very regular absolute death (launches, helis, clutch dumps, extended 8000+ rpm, you name it). Probably running in the order of 170/180 proper kilowatts. So that's AT LEAST a safe horsepower limit on a stock 5spd =]

Could be a number of things. Is the car jerking and back firing at all? Is it a hesitation or a miss? Does the idle run rough sometimes, or dip up and down? What does the boost gauge say? Is it still building boost up top? The not wanting to start when hot thing, it's common for that to be the ecu temp sensor which is on the under manifold cross over pipe. Cheap to replace, kinda a pain to access on some models. If that sensor was faulty it could be reading a false high temp and trying to save the engine? I don't really know how well these old ecu's worked so may not be that intuitive. IME on that model it's usually coil related, cracks in them etc. Check coils for any cracks under the rubber boots too. As a quick fix you can fill the cracks but the v7 coils is a good mod. And check the wiring isn't questionable too! Intake - these models are prone to cracked and damaged vacuum hoses, some may not be sealing properly anymore. A leaking intake pipe, or gasket might be losing boost pressure as it builds higher. You can pressure test the system after the airflow meter. Also BOV leaks are common. Coils - This model crack coils often, check wiring to them as well. AFM - These are prone to failure on setups that run pod filters, in my experience they generally make the car run rough rather than miss so wouldn't go grabbing one just yet Detonation - Is the car running proper fuel? E.g 98 or 100 octane fuel. Is the intercooler doing it's job properly? Are the fins bent to s*** and stopping cooling or is the bonnet vent for it still on the vehicle and pushing air on the cooler as it should. Fuel related - A tired old fuel pump not keeping up later in the rev range as pressure drops, or an injector not flowing correctly, or even a pressure regulator not working or not recieving vacuum. Also the wiring for these pumps is known to fail and give issues, a common mod is a rewire of the pump and use the ecu to turn on a relay. Good luck 😁