I keep meaning to try this, but ideally I don't want to raise a fault which may ask questions at the dealer - especially if I dontn like it and plug them back in anyway.
What is putting me off is that people don't really describe a noticeable gain. I want something that others will notice and comment on to make it worthwhile difference?
Are there any videos or a video someone is willing to make with the valves connected then disconnected?
People mention there car gets "louder" as is it beds in also. Again, is this noticeable? I am still under 1k miles. Sometimes I love the sound and others I struggle to hear anything.