Originally Posted by imma_stocker
Its something in the new FPR setup Subaru switched to in 08. Actually a common issue, not sure why your tuner isn't aware of it. The MECHANICAL (proper) fix is to upgrade your FPR and ditch the stock balancing hoses and other junk they put in. You can also swap in an OEM FPR setup from earlier year STIs (04-07 STI) if you want to keep stock setup. You'll need the FPR and lines running to and from your fuel rails to do the swap.
What are my upgrade "options"?
Just need to weight out whats the most effective solution (either upgrading or switching to the earlier years fuel pressure regulator setup).
Mind you, there is a possibility that I *might* take my build further later.