There is a chance of uncommanded full 50 degree cam advance occuring. This can happen when the ECU is doing readiness checks. I would have the stock TSX VTC mech machined for 45 degrees, it is not that bad cost wise really, especially compared to having to rebuild or replace the engine.
It is not the cam that gets machined, it is just the inner chamber within the VTC mech.
VTC does not generate any additional lift, it just adjusts where and when the lift occurs.
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