Fuck it, traded in the GTS for a Ralliart.

[Kracka]

The RA has a pretty small single-scroll turbo, so my advice would be to upgrade to a stock Evo X twin-scroll turbo setup which can be had for roughly $600-700 in nice condition. While you're at it, do a Evo X intercooler and pipe set too, this would probably cost you $200-250 for the complete set. Add in a 3-port boost control solenoid and the total comes in around $1000, get AEM's new RA intake for probably $300, plus a testpipe for $150, add in a tune for $300, and you're sitting at $1750 total (roughly). That would be a pretty solid mod list and will put down more power than a stock Evo X for under $2k in mods.