Stage 2 kit can go as high as 440 rwhp (with built engine & race fuel).
ZX14 Stage Two Turbo Kit:
Stock engine 260rwhp on pump fuel with stage 1 or stage 2 kit.
Engine with turbo pistons and HD valve springs, 290rwhp on stage 1 or stage 2 kit with pump fuel, or 330-340rwhp on race fuel with the stage 2 kit.
With a fully built engine, HD connecting rods, turbo pistons, valve springs, etc. The stage 2 kit will be 290-300rwhp on pump fuel, and 440rwhp on race gas.