Thanks I had seen one on adverts a while back don't think the calibration CD was with it. What made me think twice is ,once installed I am left with amping all speakers from the boot then I am still looking at the grom solution for Bluetooth and usb .it all starts not to make sense ( conservative 500 Euro)not to mention cableing.what ever I do with the oem it's never going to match a branded unit. The set up I have now is still packs a punch to make herself cringe and mortify the kids from a hundred yards(old euphoria cds).but there is more to it than just volume.