Convincing mom on Saw movies?

I really want to watch the Saw movies, and my dad is fine with that, but my mom is a little uneasy about it because of the torture. I'm 13, which I realize is really young to be exposed to that stuff, but I've already seen movies like: The Hills Have Eyes, Mirrors, The Nightmare on Elm Street (remake), The Exorcist, The Descent, etc. and she didn't care. I'm not really affected by watching horror movies, they don't scare me that much. How would I convince my mom on letting me watch them? And please don't say that I'm too young, I know what I'm getting into.Thanks, all help is appreciated!