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i know that NOS do a 6-point octane booster which has no LRP additives, and they state that it is safe for CATS and lambda sensors. not sure where you would buy them in the NZ but i'm sure a simple search of your local suppliers/websites (google.co.nz??) would yield some results for it.
That should be a short-term solution.
But as NISFAN said, a long-term solution is water-methanol. You can then play around with the methanol mixes so that you can achieve your own desired octane levels.
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