Car shaking at 80-mph?

[tagyoreit]

Ok, question for you techs out there. Got the GT-S with a CAI. I think this started happening after it was installed but I'm not sure if i maybe just didn't notice it before. At 80-mph the car seems to shake a bit and I can feel it in the steering wheel. As soon as I hit 90 and drop it back down to 80, no problem : Smooth as can be. . . what the hell is this about? Please let me know your imput. Thanks.

[oldster]

Have your tires checked for balance.

[rearendman0]

Thats what i was thinking. My sisters car did that (around a ten mile an hour range) between 55-66mph, once she had her tires turned and ballanced it went away.

[Griffin]

Yup - go get your wheels and tires balanced. The best kind is a place that has an RFV (radial force variation) balancer and knows how to use it.

Griffin