I have the CDI as well.
IMO, this tool is the most critical part of doing this job right.
They usually run around $400 and come with a calibration certificate.
I have no experience with other brands.
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'21 M2C Hockenheim Silver
'18 718 Cayman S Lava Orange (sold)
'13 E92 M3 Santorini Blue (sold)
'07 Z4 M Coupe Alpine White (sold)
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