yeah, i would keep the 440's for what you are intending on doing for two reasons, 1) as slash mentioned your really not going to *easily max them out with the ct20b, and 2) if you move up to the 540/550 then you are going to need to worry about much more as far as engine management. An safc alone wont do the trick, you would have to combine it with an afpr or something to get it to work well with the gen II, or spend a ton on a good stand alone.