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it started sunday all of a suden when i hit 4th gear my steering wheel shakes ? what can this be i just got the car in august its a 2002 Si coupe but in the 1,2,3 gear it doesn't shake?? what can it be

 
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Might be your wheel alignment off. Have a wheel and suspension alignment bro that might solve the problem. But before gettign all that check your tire pressure after driving for like 5 minutes. Make sure it's above 32 or so.

 
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balancing, balancing, balancing... alignment can cause the steering wheel to shake but 90% of the time its balancing... maybe one of the weights fell off or something..

 
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If your issue is only in 4th gear, go back to the dealer and have them take a look.
If it's still under warranty you shouldn't pay anything.
I have no idea what the actually problem is....

 
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I had a problem with my car shaking around 60mph last week. I determined that it was the tire pressure. It had been really cold, and my tires were covered in snow, while sitting overnight. It only lasted until the tires were (what I thought to be) normal pressure or heated up. I haven't had a problem since...

 
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When your car shakes like that, it's because you proably have snow inside your wheels.... either scrap the snow off, or go to a shop to get them to spray it off with a pressure washer

 
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I had a problem like this when I put my stock wheels back on for winter. The centering rings that came with the rims I got were still on the rotors and caused the wheels to not sit evenly against the rotor and eventhough I had an alignment done and they told me they were barely off, I almost three-wheeled on the highway cuz one of the rear ones almost came off. If your steering wheel shakes I'd have it looked at emediately since its possible that even a cm off could cause one of your wheels to shake itself lose at high speeds.