Logic Pro 8 Installing/Modifying Install/Uninstalling


Hi All,
I've been using a mac now just over a year, but there is one thing that is puzzling me, and this specifically relates to logic 8, and has reared it's head now 9 is out.

It's to do with the content. When I install Logic 9, will I have two sets of content, one for logic 8, and one for 9? Obviously this is a lot of HD space. Also, if I want to remove any of this content at a later date (such as surround sound impulses), how do I go about this? Back in the windows days there was usually just a remove function in the installer, as there was for adding it on the mac. I'm just a bit confused by this, so any help would be greatly appreciated.