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was it 102ron 15 years ago when the pre facelift classic was starting out,
i had a z4 ecu fitted out of a 95/96 wrx and that showed no knock activity in 12 months running it on v power 98 ron (no booster)with a full decat.
in my experience the early imports are fine on v power or tescos 99ron even with a full decat,im sure it wasnt that high a do ron ron rating in japan for the pre facelift classic anyway.