NOS? you kidding, right?
There's not much you can do with this car. Bolt on mods won't do much. And I doubt TRD make a supercharger for this engine, last time I check anyways.
If you're hardcore enough, you can always disable the VVT-i and slap on a turbo

But that's going to cost an arm or a leg.
This car isn't meant for going fast, so you might want to dump money into investing for something that is.