Hello everyone, I need some assistance with an issue.

I just bought my 2006 CS in January. I want to add the PCM and the Navi to it and I found a fairly cheap one. I have read K-Man's awesome blogs on the installation so I feel that once I have the system it will be a cinch to install. My only issue is buying one that will not work.

On the blog, it says to make sure the PCM is newer than your car. I dont think that this one is. Will this cause a big problem? The kit...