with.
X pipe makes it deeper & a little louder.
These are designed to work together.
...still quieter than RPI w/o X
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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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