so, i was driving the beater the other day and i noticed something. when i would get up to 80-90mph, the car would start shaking! the faster i went the more it would shake!!! what is going on?
My car is SHAKING!?!??? - 6G Celicas Forums
Could be improper wheel alignment. When/how did it all started?
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Just do the speed limit then. 
2001 Miata LS 5-speed
Your wheels aren't balanced properly.
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Do what everyone is saying. Take it in for an alignment and tire rotation and balanced.
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Get your wheels balanced.
Get a wheel alignment.
Get a wheel alignment.
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change the muffler bearings.
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^^^ 
check lower ball joints, check busted cv joint boots, check outer tie rods and tie rods & balance and wheel alignment
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Made my day!
QUOTE (njccmd2002 @ Jul 4, 2013 - 10:33 AM) 
>change the muffler bearings.
Made my day!