Quote:
Originally Posted by M4driver
you had your secondary cats removed correct?
would that attribute to the drone?
GLWS
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Yea, I had secondary cats removed when I had this installed.
Secondary cats on M3/M4 midpipe is pretty restrictive ceramic cats.
Even stock exhaust got pretty loud after removing secondary.
Pretty sure exhaust will get quieter with secondary cats in place.
I am not sure if it will reduce drone but most likely it will somewhat due to flow restriction.