I feel like you will make more power (not a huge amount but more than what you have) by switching to the manual transmission. One thing about subaru's, same motor same same, one with CVT the other manual. the manual is noticeably faster than the cvt due to how the cvt reacts to throttle input. the tests were don't side by side and switching driver, and cvt was always slightly slower than manual due to its nature. so you might blip over 120 after the swap. get it re-tuned of course to match the trans gearing as its also different than cvt.