Me personly: I just modified my stock snail. I went to turbonetics and stuffed a 57 wheel in it That way I have a modified turbo and there are no fitment issues and I can easily pass smog, especially when it says "Toyota" on the housing.
there isn't much to see but it is all stock looking, it just has a bigger wheel stuffed inside a stock Toyota housing. I have a two stage boost controller, which is hidden and fuel pressure regulator underneath the intake manifold but on the block. Of course you can't tell that the AFM is off a Lexus SC 400
If 7m Albert makes a 57 upgraded stock turbo that will make 400+whp. really good response and good all-around driving. I have a SupraSport Boss turbo that someone might be able to take off my hands for the right price which is a full turbo upgrade that bolts on to the stock manifold. Similar to the turbo Alec used to make 650 WHP on his mk3 7m.