OP if you ever decide to add the JB4 you will have even more control of the valves on the exhaust by utilizing the feature CANflap on the JB4 which allows you to open or close the valves whenever you want right from the BC stalk on the turn signal!
I was Fabspeed's R&D car to build the exhaust, I will also be posting my review and a bunch of sound clips very soon just have been so caught up with my new job
