Bosal 2.25". $300ish @ Newedge.
-Exhaust note w/ stock header + cat
-Silencer avaliable if it's too loud for your liking (though it is one of the more quiet systems on the market).
-Raspy, boomy, and altogether loud (IMO) at higher RPM with an aftermarket cat/no cat.
-Design. I don't really care for the "fart can", but it sounds good so i'll forgive them.