S&S came out with this air cleaner setup a couple months ago. It retails for $129, making it $10 cheaper than the harley stage1 & also has a washable element. I've found it will support at least 110hp.
They've also incorporated this standoff in the cover portion, which I thought was pretty slick. Looks like I should have went into production a couple years ago. Click the link for the aircleaner on my bike.