For comparison, my stock 1.6l mx5 motor will only get around 130hp so this will be a substantial upgrade. Turbo upgrades will get the little 1.6 engine up to around 240-250 at which point things will start to fail, like the rods, or the gearbox.

It may be that the first stage is just the stock engine, then look at options for more power / revs later.

A stock K20a / K20a2 your looking at 7,500rpm ish, maybe 8000 with an ECU, is that right?