I'm planning on making a custom air intake hose so that I can retrofit a 3.5"rdx6" dual layer foam air filter onto an MP3 500 (this size should good since it exceeds the area of the OEM filter). I've seen the infamous Scarabeo 500 mod with the 2" turbo hose (http://apriliaforum.com/forums/showthread.php?t=173153), but the engines are not the same and I don't think that the routing of the hose will quite match his approach (although I'd LOVE to be proven wrong).
I'd like to get rid of the existing airbox that could not have possibly been designed by an Italian (read that as UGLY).
My question is for anyone who has their scoot apart (or may be working on it) - can someone measure and tell me what the outside diameter of the intake connection on the engine end is? I'd rather not start tearing mine apart until I'm ready, but I'm going to need that diameter so I can start tracking down a piece of hose to fit (or adapt to fit).
Any help would be appreciated.