As many of you know/have said the chassis of the Mazda 6 is really good and holds up even in spirited and track driving. I was just wondering which areas can be upgraded and improved over stock. So far I only have front strut tower bar (kind of a suspension upgrade) and rear sway bar upgraded. The stock endlinks are holding up fine, but if they make a significant difference I am definitely up to changing them out to the Moog ones. Anyways, what other areas in the suspension need work/can be modified to become stiffer?