Hi Hugh, regret late reply. make that very late reply. Happy to share the info with you in fact you have probably had it done by now. We have a forum which you may know about PORSCHE FORUM AUSTRALIA, very strong Vic and NSW members, I am known as NIKO on that forum, come across and say hello if you ended up with the car. Come across and say hello even if your still looking. Great advice on a local level available.
I noticed that you are from Melbourne and have had your IMS upgraded ( was reading through the sticky about IMS failures).
I live in Sydney and am in the process of buying an 04 s boxster from a guy in Melbourne. I have planned to get the LN retrofit done straight away so I was wondering if you would be happy to share with me who did the work for you, what the cost was and how it has been since?