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30mm intake valve, 9.9mm lift, valve float at not much over stock boost and 5500rpm. Making over 550HP is where it gets difficult.

The valve lift on the Valvetronic engine will be a limiting issue. Maximum lift is at 9.9mm. There are no high lift cams available and unless you know how to make more intake valve lift, the power output will be limited even with more boost. Valve float is also an issue with higher rpm and...

I haven't heard if the engine blew at lower power levels but the current engine was built with stronger forged pistons and rods. Maybe just preparing it for bigger/higher power levels.

Valve float is especially an issue with increased boost.