yes!!! Its a simple swap. The RNS 510 is a cracker unit. You can install the map onto the HD, and the whole touchscreen menu system works a dream. You can also watch DVDs on it (while stopped).
You than have about 30GB to store MP3s, plus MP3s on your SD Card. I have one going up onto ebay next week so keep an aye out for it. When I was fitting it I stupidly broke off the clip that holds in the GPS connection but with a bit of insulation tape it holds fine and works perfectly. Ill be putting that on the along with photos and a full 14 day money back guarantee if the winner wasnt happy with it. Its version A one from my MK5 GTI which I sold a few months ago and in as new condition (apart from the clip). Screen is 100% unmarked.
I honestly cant recommend them enough. If you need any further info on them just let me know.