Unstable over 80 mph

[Nate047]

Start by looking to see if there's a clean spot where a wheel weight or two could have recently fallen off.

Also take off the front wheels and torque the lug bolts/nuts/studs correctly, and like someone above said make sure there isn't corrosion or grime preventing them from sitting flat.

[Tbonem3]

Happens a lot when the hub and hublips are corroded which makes it easier to mount the wheel crooked. Make sure it's clean and smooth and make sure you tighten wheels in the star pattern.

[Slideways]

Have the shop double check the alignment and wheel/tire balance.

[mr pete]

I know you mentioned new tires, but are they properly balanced? Check lug nuts also.

[Halftim3]

Some ideas, Miles on front control arm bushings and tie rods?

[Leafsrule531]

My car seems to drive perfectly below 75 mph. The steering is tight and it feels very planted and resposive. As soon as I go over 80 mph, it comes super unstable. I get a slight vibration in the steering. Steering starts having play, and car feels wobbly/ unstable while even turning on the highway. Even when I brake from that speed, it almost feels like car becomes unstable like it’s going left and right and I have to hold the steering very tight to make sure it doesn’t swerve. Any thoughts on why this could happen ? I replaced the steeeing coupler around 15k miles ago. Has new tires on it. Kw v2 coilovers. Just had an alignment done too.

Getting pretty frustrated because that’s not how an m3 coupe should drive. Any advice will be appreciated!