First of all I would like to apologise for my complete lack of knowledge of all things Subaru, always been an old Merc driver until now.
Just got a 2003 WRX Sportwagon that I (and the garage I got it from) thought was completely standard. On closer inspection I notice the exhaust tailpipe has Prodrive engraved on it, I have read that this exhaust is only available with the rest of the PPP. I have it insured as a WRX and should probably tell them if the PPP is installed, is there a definitive way of telling?