Anti-lag ?? Lag is a big issue with these cars , seems to take forever to build boost
Guessing you want pops and bangs, launch control and the ability to limit the rpm ie valet mode ? You could achieve this with a Bee R limiter , by far the cheapest option , not that I am recommending using you car like this or using either launch control or the rpm limit on a regular basis
http://www.ebay.co.uk/itm/BEE-R-REV-LIMITER-TYPE-B-SUBARU-FOR-NISSAN-TOYOTA-LEXUS-LAUNCH-CONTROL-/290842127668?hash=item43b78aad34:g:LVgAAOSw-FZXj0Cs