Hallo everyone, I am building a MC18 R2 and new to the group What and from.what I've seen, the knowledge in this group is awesome so I am really happy I found it. I will be tapping in alot over the next few months as I finish my project. I need a bit of help, I believe there is a difference between the MC18 R2 and R5 airbox. Could somebody please tell me what to look for or what the difference is as I do not have one at the moment and am looking to buy but do not want to buy the wrong one? Thanks Troy.