Engine noise filter

[COINERS]

Ok so I was walking through Autobarn today and I saw something in the car audio section called an “ENGINE NOISE FILTER”.
I think it was a white box with a bunch of wires hanging out of it.
As an audio enthusiast im always open to adding to my system.
Can someone please shed some light on these things and are they worth getting. I think they where about $30.

Thanks guys
Nick

[StoneX]

People who have problems with their wiring and have audible noise usually buy them, but they're not recommended by people who know what they're doing as if your wiring is done properly, you should have no noise anyway.

I've seen heaps of people post about noise problems and get told to buy one, then come back saying it didn't do anything...

[COINERS]

ah ok thanks mate