Ok, I've searched and searched and i find 100s of "my car is shaking" posts with almost no helpful information. Most of these are old posts and seem to have been forgotten maybe so I'm posting again to try and figure this out... sorry because it's gonna be long with lots of info, because I've done quite a lot trying to figure this out.

I have 2012 GT/CS and I have no suspension mods (yet), i bought some 19x10 wheels (SVES350) with a 40 offset, and the wheels and tires fit perfectly fine all...

2012 GT/CS shaking at normal/highway speeds