Yep, $1000 bucks would get you most of the way through a 4age conversion if you were doing all the work yourself and you purchased parts with vigilance. Past extractors, I wouldn't be doing any more major mods on a 4afe, 'cos by the time you start noticing worthwhile gains, you've spent enough money to swap a 4age in and it'll still be slow. I'm not saying that they can't be modded to make a lot of power, but that sounds out of your price range.