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I'm running CATs.
Just got back from a track day and noticed more exhaust noise (different) on the way home.
May be similar to you, I'll investigate further today.
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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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