Usually if its sensors, it will drop the code in the ecu as a low voltage front, middle, exhaust sensor
It didn't show
Could it be signs of fuel pump or filter on way out

Fuel pump is probably on it's way out....

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Checked the coolant / oil for any cross contamination.
Check the intercooler hoses

Then I'd be checking the plugs. If the plugs haven't been changed since new (75k) they may be cactus and causing a missfire under load.

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MY00 WRX. 89 Prelude. 99 CRV

Fuel pump is my bet

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For anyone interested .... the car actually "bugged out" ( forgive the pun ) yesterday and wouldn't run completely.

I rang-around the go to mechanics and Maximum Motorsport were able to squeeze me in at late notice so I had the car towed to Malaga.

Not sure what the exact problem was but they disabled the brant and discovered a air filter falling apart which had fouled the maf. I think I would have noticed this when i tried cleaning the MAF so I suspect the Brant might have been to blame and the airfilter/maf issues followed thereafter.

Oh and they checked the fuel pump after the Brant and the pump seemed to be functioning totally normal.

Hopefully that has sorted me out

Can't speak highly enough of Maximum Motorsport, they were professional and thorough.