It's cuts the noise down a little but ideally I'd like a system I can run all the time that still sounds good when it's opened up

Not sure how likely this post is to work given how empty the for sale section looks... well see though.
From what I've read Mongoose and blueflame are my only other options for the NA but think I read something about a rarer berk exhaust somewhere? Not sure there'll be any around anymore.