ok i was just curious what a high flow cat would do for me. the guy who had my car before me put on , i think a 6in weopon R exhaust with no converter or anything. its just 2 and a half or three inch pipe to the exhaust. i dont live in cali and i know a easy going guy for vehicle inspection so im not very worried about the converter being there or not. right now its loud as hell before i even hit 3500 , will a high flow make it quieter, deeper or will it rob me of hp or anything else for that matter to have it on

thanks in advance
travis