I'd rather have people on the Internet who give advice err on the side of caution rather than say "dude you are so smart, go for it". I want to see this magical S15 that you can sleep by. Either you're used to sleeping with a hair dryer running on your nightstand or you've made the equivalent of the 400MPG car...

Anyway, if you're just in it for the fun get an older Avalon and downclock it.