I downloaded the pdf installation instructions for installing chin spoiler before purchasing and I wanted to know from people who installed it how hard it was to get straight and install. I'm comfortable doing all of my own work- I just put the borla system on, am going to do tstat, spoiler on my own but those instructions confused the **** out of me on the chin spoiler! Are you pop riveting it on or screwing it on? Any tips/advice is much appreciated. The instructions have literally NO words in them, obviously written for people of any language ability to understand but it's actually more confusing to me. I felt like I was looking at one of those rebus puzzles. Thanks.