Don’t think I’d be arsed with an eventuri, they are big bucks for what they are. I have a Carbonio in my m3 which seems to be a copy of a gruppe m and if it wasn’t in it when I got it I wouldn’t have paid the price for it. Airbox or standard for me I think.

I can probably source an airbox on its own for a good bit less than 1k if your interested. Much like what schooner is talking about above.