Hey Mike... The part is made from 6061 aluminum alloy and can also be had with a bellmouth end at 5.7" or such (tech drawing on the website).

Ideally, I would like the SIR to feed a voluminous airbox which feeds the HFM...space is the problem as well as the entry angle from the stock intake position by the rad however.
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The pictures on the site all look dark; so it's annodized aluminum, then?

I saw the drawings of the bellmouth part, but I don't understand the application. Is the idea that it would suck unfiltered air, then I'd have a filter inline, then go on to the MAF and throttle body?

On my car, I have plenty of vetical room -- straight down in front of the left front wheel well and behind the headlight assembly and bumper. I think the Dinan intake kits hang a filter all the way down there, for whatever reason.

Why do you think the airbox is important, buldogge?