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I needed a jcw airbox for my track car and was put off by the prices so I designed one from scratch. I built it around a amsoil filter that was subsequently discontinued, a injen x-1021-bb also fits (tightly! as pictured) you can use a generic or K&N too as long as it has a 3.5" inlet diameter
You'll need to open up the divider between the airbox and the abs lines to get the full effect of the airbox.
Printed with ASA (modern abs) I've been using one on my track car for several months. 3d printed parts look 3d printed, small blemishes, pictures are actual airbox I'm selling
What's the difference between a regular cooper s airbox and a jcw airbox?
opening size in the rear and the adapter for a cone filter to sit inside... a real jcw box has a flap that's rpm controlled too so it reduces intake noise.. ( lame )