I really would not rely on a meth injection system to net you any power on the stock block, failsafe or not. The real gains from water/methanol injection come when you lean out the mixture and add back timing. Doing so on the stock block is only pushing it further to its ultimate failure point, past it if the methanol system has a fault.
If you're going to use it just to cool the intake charge and make a couple of hp, then it would be fine to use - no danger in doing that. But you really won't see much gain at all slapping it on. In fact, you may lose hp if it causes the mixture to become too rich.
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'10 PW 370Z 7AT - wife's car - Project Raspberry Cheesecake
'08 Evo X - built motor+trans | BB-X @ 32 psi | CH3OH | self-built+tuned - ??? WHP
'01 Galant V6 - built motor | GT35R | self-built+tuned - 550+ WHP (retired)
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