I wasn't a kit. It was just a spectra filter. The spacers were in the filter neck. I got it at a local SC store. You should be able to get it just about anywhere.
Take a look in the box. I can't remember what size I bought. You can also get adapters off the shelf.
I bought a rather large cone shaped one because I was going to route a DIY CAI. changed my mind when I took a good look. Defineitly measure and get a smaller tube shaped filter. You should be able to push forward into the fasica a little. I changed the poition of my horn so I could get the filter into the fascia more.
I did not want to destroy the MAF tube in case I wasn't happy with the results.
I just drove around today in a good size rain storm and hit alot of puddles. I found no ill effects.
I took a look and not muchwater splashes into that area.
Yes, you can remove everything. There are DIY instructions at the top of this form for a stealth setup that explains how to remove everything.