You will need to install the Cobb AP stage 2 map or go open source tune if your good with a lap top.
Check out the Tuning forum and the Vendor forum for info.
I use www.tuningalliance.com
a vendor on here my tuning needs.
You also should install a catless up pipe
miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
Engine Build - Click Here