IMO at least a 20g if not something a little bigger.
Talk to the Tuner who will tune the car. That's the best info you'll get.
185k, 5/20/12 new ej257 short block, 8/20/11 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
Engine Build - Click Here