I found this little item in the seat storage in my Fabia, I've only had car for a month or so. It has a the lighter adapter for power and a female jack socket I also found a cable sticking out of the center console which plugs into this part I have no idea what it is or does. When connected nothing happens or appears on dash or radio. Enclose some pics 

https://labworkauto.com/products/labwork-2-5remote-electric-exhaust-catback-downpipe-cutout-e-cut-out-valve-63mm

Oh dear, it looks like your car has been seriously screwed around with.

 

If you bought it from a dealer and therefore have some rights I would take it to an MOT testing station and ask them to look for any modifications to the exhaust etc which would result in a failure, preferably not (at this time) the garage who issued the existing certificate.

I'll have to take a look and see what's been done. Thanks for your help, I take it this device is no good without the remote?