The best way to get another 100kw from your setup is going to be with the evo green, auquamist HFS-5, and a better flowing intercooler.

A big turbo is only going to be laggy. Even with a 2.3 a 35r spools way slower than a 2.0/evo green. A big turbo can make 300 easy without the auquamist kit but at the expense of lag. It will not be the fun you are looking for.