if you do keep the slush box you'll only be able to run around 6-7lbs of boost. if you upgrade to a 5spd you can push up to 15lbs of boost on stock internals, but you're going to need a going to need the AEM EMS for that, not to mention other fuel upgrades. I think its cheaper and you'll gain more power if you boost an F23, than to swap in an H22. talk to bronn_007 on www.honduh.com he's selling his setup. $3000 including the turbo kit, and fuel management.(includes AEM EMS, GM 3bar map sensor, and various goodies) if you can't afford that, he's selling the turbo kit for $1800. the only catch is you have to give him your intake and header, doesn't matter if its stock.