My Evo 9 made ~260whp stock and with a header back exhaust (cat deleted), cone filter, MBC and tune it made 350awhp/350tq. But that was running ~23psi of boost and I had a wideband + datalogging going all of the time because it was close to the edge and would get knock sometimes.

Meanwhile this Evo X makes 10 more ft-lb of torque, has a better overall curve, and similar mods. So yeah the X definitely looks to be a big improvement.