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SLP long tubes with high flow catted x pipe and LMs are CRAZY loud. They'll hear you coming 5 block away. I have this setup only with the SLP PowerFlo axle backs. Very nice sound, not too loud unless you get on it. I have a blower too.
I've got the SLP headers and x-pipe with high flow cats with the FRPP stingers. It's loud when you get on it and very throaty. I think the loudmouths would be extremly loud.