If the stock manifold is anything like the SR20, it should support ~350-380WHP or so before it becomes flow limited.
Are you shooting for more than 400WHP?? What is the reasoning for sticking to a top mount??
The easy button is buying a used good quality top mount setup and re-use the turbo originally planned for bottom mount.
Last edited by RalliartRsX; 10-13-2016 at 11:35 AM..
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