FORUM RULES UPDATED - The forum rules have been updated to continue to provide a friendly and safe environment for our member community. Please take a moment to review the updated rules and our terms of use and privacy policy. Click here for Forum Rules which has links to the 'terms of use' and 'privacy policy'.
Hi all, I've been reading threads like this vigorously trying to figure out if I need to replace my exhaust (and potentially my CATS) -- I have a 2013 Monterey SY 340 with twin Merc 377 Mags EC - with PCM 555 control modules.
SERIAL NUMBER(S):
Port; 2A079834
Starboard; 2A031052
My question --...
