So I have had the IS since Feb. So far I have I have lowered it with a set of Hotchkics springs and installed front and rear adjustable sway bars. To help stiffen up the car I picked up a TOM's rear strut tower brace. I then added an AEM intake so that I could hear something from under the hood. My last upgrade was to the tires. I went from a 215/45/17 to a nitto invo 225/45/17. The tires plus the suspension has made the car so much fun to drive. I find myself pushing the harder and harder. Right now I have the soft settings on the sways and if I ever make it out to an autox I may try and tune them in. Just thought I would share with my mazda peeps: