Check for knocks, also is this happening in what rpm and does it clean up after 6k rpm? I've seen this on a lot of pump gas here in the USA as the quality varies from tank to tank.
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60-130 6.5s X4M
60-130 5.04s G80 M3 Stock Turbo
60-130 4.82s | 9.4@148mph 1/4 Hybrids
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