Looks like a few bolts have to be removed to get the inner intake tract removed:
http://hanabi.autoweek.com/sites/def...?itok=_k8-fiPx
The cover has the usual four twist off pins and likely forward and up movement to get it off.
My guess is the intake tract is simply not long enough to get laminar flow on the Ariel 3, hence the longer tract seen here. OR... Ariel 4 simply has a cleaner look with the roll bar integrated and the downside is a smaller intake tract opening.
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