The Coil-Air is really just an air-shocked version of the original Coiler, which did have a coil-over shock. The Coiler was offered 2004-2007 models and was then dropped in favor of just the Coil-Air.
You should be fine switching if you really want to but I have to ask: Why? Is your RP2 not working properly? Or do you just prefer the 'feel' of a coil-over?
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Originally Posted by Mark Twain
"Don't argue with stupid people; they will drag you down to their level and then beat you with experience."