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IMO straight piped will be the loudest. I have heard most of them all, and my wifes straight piped 00 GT is by far the loudest compared to other setups.
SLP Loudmouth without a doubt is gonna be the loudest exhaust system you can buy. If you wanna scare old people and small childern then thats the exhaust system for you. As far as fitment goes, SLP's quality is amazing. I have heard nothing buy good things about fitment and quality of the system.