You can hear a difference for sure. If you want to hear it idling I'd get the water box. You cant hear a difference idling. The rear exit exhaust is louder the the stock location but I don't want to cut a hole in a already temperamental hull
looking forward to that video, i wonder if it even makes the slightest difference in performance even if it's not noticeable when riding, maybe something that can be picked up when it's power is measured?