I went through this when I spent $1500 for my sportbike exhaust. Bought it, explained it later. As stated earlier, easier to ask forgiveness than permission. She told me for months I couldn't get it. Did it anyhow. Still married.
Best of luck to ya

 

Dude, what you just bought many of us can only dream of saving up for...all I can say to you is goood luck with the wife. Hope your still around after dropping a couple of G's. lol