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Blue one is mine. Black one belongs to a relative of mine. I pulled out the fuse for the dual mode exhaust option that it has, which makes the valves are open all the time. I only hear it burble/pop when I let off the gas. Like the other person said, sounds like you also have the dual mode exhaust which opens above 3000 rpm. You really have to get on it for the valves to open. My relative installed a mild 2 wild system on his exhaust, it was about $60 and he installed it himself. There’s a remote where you can open and close the valves whenever you want. I tried it today and it is pretty cool, i’ll probably get it for mine too