what they have installed to your car is not a NOISE SUPPRESSOR but rather a VOLTAGE FILTER... if you take a look inside that device it only contains capacitor, diode, fuse and a small coil that acts as a voltage filter, modern HU systems have these devices "built-in" so no need to install an external filter.. this device is commonly attached to HU with TAPE decks or cars that are NOT YET EQUIPPED with IC REGULATORS but cars with IC Regulators and CD/MP3 DECK HU do not require this device... They come together with the HU unit when you buy and you cannot buy them separately.. This means what they have sold you is already USED or came from another used Unit...Also having this device installed will commonly cause "STATIC NOISE" since their function is conflicting with the "built in" static suppressor in the HU. I'm sorry for your experience..
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