You won't get too much out of the 3SFE by itself, there will be mild gains with the usual intake/exhaust (I think Gen1-3 3SGE extractors do fit straight up, which gives you more options). Other than that, there is the custom turbo route which, whilst unique, won't net you the best bang for your buck. Best option is to go for a full 3SGE/3SGTE conversion, but for the money you could be better off actually buying someone else's finished project for much less than what it would cost you to do it yourself