When the 2007 first came out I asked if the Sport had stiffer suspension tuning, and no one knew.

So has it been confirmed beyond the shadow of a doubt that the Sport has stiffer springs and/or thicker stabilizer bars?

 

I don't think that was ever in doubt, Yes it was confirmed by my dealer that the Sport has stiffer suspension tuning. What was in doubt was if the 4was package had even another level of suspension tuning. the answer to that is No, at the last minute Infiniti took a little too much heat on how stiff the Sport w/4was was, so they decided to "sport" up the sport a little more by adding part of the tuning from the 4was package, then the 4was package has no additional tuning. so as it stands, the Sport has improved tuning over the base/x.

 

whatever they did it flat out feels great and works well