At about 100kph, my car starts shaking like crazy. I can't really feel it in the steering wheel (it stays straight) but the whole car is shaking. If i go faster then 105kph it stops if i go under 100kph it stops. Any ideas?

 

wheel imbalance, hub issue, axle issue

My guess is it has something to do with your Vizion rims and Wanli tires install, OR your 15000k HIDS....

 

well im pretty sure my struts are blown since ive been rockin eibachs since 1000km and im almost pushing 70 000km now, so could that be the issue?

 

if you turn down the radio you'll here a rapid thump that can be associated with blown struts. you'll even hear this thumpity thump thump thump on what you would perceive to be flat surfaces.

 

Its not likely your struts are causing a speed related vibration.

 

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i need new struts. this is my new problem to a T. although not that bad, its noticeable. have a feeling its going to get worse

 

Hm... that "bumping" sound I've heard for the past 30K miles appears to be my struts. I've never changed 'em and I'm at 94K miles, haha. I'm such a loser when it comes to my Cobalt.

 

well i can't see it being an axle issue as i don't get any clunking when turning. Could be wheel balancing