vibrate or shake

Hi everyone, Looking for some insight into a problem I am currently facing with my car. I own a 2021 Genesis G70 2.0T w/manual transmission. It is lowered on Eibach pro kit springs and upgraded Whiteline sway bars front and rear. Whenever I exceed 130 km/h, the car begins to shake very...

I got a new set of Michelin PSAS4’s on my 2018 G80 sport back in February. 28,000 miles, had the car since 4,000 miles. Car drove perfect before that. Americas tire shop changes them out along with a balance and alignment. When I get it back, car drives like it has a flat and one tire is 50psi(I...

Have had my 2013 R-Spec for a month now, after upgrading from a 2011 4.6. I've noticed a subtle but somewhat fast, high-pitched shaking or vibrating back and forth in the steering wheel when driving at higher speeds (>50mph approximately). Seems to depend on the road, too. I never noticed this...