I remember seeing on here that blaupunkt did a cable that fitted into the standard GP HU. The cable let you put in an aftermarket sub+ amp

for the life of me i cant find where i saw this
anyone know?

I dont think it works but this
http://cgi.ebay.co.uk/Blaupunkt-car...39:1|66:2|65:12|240:1318&_trksid=p3286.c0.m14