Yes it's the official subaru optional extra but it only specifies 'sports Rear silencer kit' in the options brochure. The dealer thinks they supplied a non UK kit by mistake - they reckon Subaru UK called them and said they had accidentally supplied 2 units in the UK and one was mine.
I'm not sure what the centre pipe bit is but it's definitely removed the small rear cat. It's not aftermarket loud, just has a deeper bassy rumble so it's ideal for me.
I'll contact my dealer for a bit more info though as I only found out over Christmas and haven't followed it up
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