Doax: Under 5? Nothing (of course). That's why I'm studying the heck out of aerodynamics. The only way I'm getting 5 or below is to get (an affordable) Insight or something that's over 5 and mod the heck out of it. So what I'm trying to do is figure out what mods are most likely to succeed (for a given car), how much effort they are, etc etc. and weigh them against other options. It's just a small matter of homework
--Steve