OK so the Fuel pump and sock are stock, I cant work it out, i can do everything to make it surge on a Left hander but not right handers and this is happening on anything less than half a tank, of course if I drive through a right hander without pinning it i dont get surge - but that's no fun on a windy gorge lol - I'm thinking I may just have to get one of these? http://www.ebay.com/itm/GENUINE-Subaru-Impreza-GDB-Spec-C-Anti-Surge-Fuel-Pump-STI-S202-S203-S204-RA-R-/142125555516?hash=item211757df3c:g:JZsAAOSwPCVX-WAs&vxp=mtr
The car is stock except the following
turboback exhaust
Tuned to 200kw
HKS BOV
And don't anyone tell me its the tune causing it cos it was doing the same before the tune as well