Been a min since I've made a post, installed my Berk Tech Resonated Test Pipes sometime ago and they sound good with my Stillen Catback Exhaust. Only thing is my Passenger side O2 sensor finally died on me, a small exhaust leak in the exit of my Y pipe (due to a rusted out gasket), and a rattling sound from me knocking something loose when I had to drop my Y pipe to install my Resonated Test Pipes. New things to work on with my Z