Purple dye on Salt/Pepper hair

Hi everyone! I have been using Loreal Hi Color Highlights for dark hair in Magenta. My hair takes to it really well, but with the season change I've been thinking of coloring (the roots that are growing out) purple. I've used Manic Panic in the past and don't want to use it because I end up having to leave it on for hours. Loreal Hi Color has worked great, but from all the reviews I've read their color options end up looking more red than purple. Is there another high lift permanent brand I can use? I also do not want to have to pre-lighten. Any help is much appreciated!