I currently have the 2zrfe turbo kit on my 2011 toyota corolla and i have the 4 speed auto transmission. Now unlike the manual, the auto has aftermarket upgrades (just look up u341e transmission upgrades on google). The company level 10 has an upgraded torque converter, valve body, and clutch packs for the this specific tranny on the 2009-2013 corolla. Im running 10 lbs of boost from a gt2560r turbo into my 2zr-fe with no internal upgrades, just a transmission cooler. From my experience, the transmission still holds but slips a little bit. Expected from an econobox tranny.