Spotted this on eBay, would this really convert a GS to GSA? Looks like everything is included.
http://www.ebay.co.uk/itm/13-15-BMW...546742?hash=item33b7e4a3b6:g:OKoAAOSwMHdXRKpD
http://www.ebay.co.uk/itm/13-15-BMW...546742?hash=item33b7e4a3b6:g:OKoAAOSwMHdXRKpD