Removing the cat won't throw a warning light. You will have to do something about the lambda sensor and the exhaust valve though. The Guhl reflash on my bike disables the valve so you can simply disconnect the cable.
The Akrapovic race system has a threaded boss to accept the lambda sensor. Not sure if Vandemon has this? I think there's a sensor eliminator available for the ZX10 which plugs into the loom, the lambda sensor for that bike is the same part number as the H2, so it might work. Or you could get a reflash for the ECU which would solve the problem and have other benefits.
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