What mods are you using to stiffen up the chassis? I'm curious since I plan on using the Z as a drift car to learn on. So far I only know about the 3 braces available from GT Spec (
2009 + 370Z | www.gtspec.com). Other than that, stiffer sway bars, and your common suspension mods. I don't think changing out the strut tower bars are necessary as they seem strong enough.