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Just noticed on a long trip over like 60 mph my car shakes like i feel it on the steering wheel shaking and once i get up to like 75 80 damn it shakes like no other, I just got an exhaust and new cat put on not too long ago, could it be the exhaust is loose or something? And I just recently had new brakes, tire rotation and wheel alignment done few weeks ago. What's the problem?

 
Rep Power: 290

When my car does that it's because of the little bumps in the highway. Maybe it's your suspension getting older? Could it be your 18" rims and lowered suspension causing you to feel every single little bump in the road?

 
Rep Power: 811

I had the same problem, but it went away when I got new tires to replace crappy firestones. Just the tire change fixed it, even before an alignment.

 
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I've had the rims and suspension for about 9 months now, i dont have shocks could that be it? Nankang tires on 18s could be possible too??

 
Rep Power: 304

Could it be as simple as the tires needing to be balanced or the need for an alignment?

 
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mine veers right

 
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Take it back to the shop that did the work; sounds like they didn't balance them correctly, make sure they use a differnet tire balancer because some don't "spin up" fast enough. Its also possible that if they re-surfaced the rotors they might have gotten one or both of them out of round. That happens when the rotor isn't perfectly squared up on the brake lathe. I doubt thats the problem but I've seen first hand; it happens when the lathe operator gets a small piece of debris inside the rotor hub, and when the rotor is put on the lathe spindle its not perfectly squared up. Then the rotor is basically "re-surfaced out of round".

 
Rep Power: 290

. . . .

 
Rep Power: 304

do what SOLAR said and get your tires rebalanced.

 
Rep Power: 320

I agree, sounds like a balancing problem

 
Rep Power: 290

How long has this shaking been going on? Was it happening before you got the brakes and wheels worked on?

 
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Ya it was actually worse before the brakes and wheel adjustments and it got a little better. Just noticed this about 3 weeks ago when I took my car on the highway. Before it would shake at like 50 now it shakes over 60.

 
Rep Power: 290

Does it shake at all when you idle or at low speeds?

 
Rep Power: 359

go get a 4 wheel alignment done.

Tha will solve the problem.

 
Rep Power: 338

mine does the same when I shift really hard from 1st to 2nd, and sometimes 3rd.

 
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^^^lol

 
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Sometimes it does shake at low speeds not till like 35-40mph but very little almost unnoticeable but once I go faster it gets worse

 
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ditto. get your tires rebalanced and make sure your tires have correct PSI. Sometimes if you have uneven tire pressure, you will feel the shaking at moderate speed.

 
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maybe there is a stone stuck on your tire tread.

 
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check your wheel allignment, i had the same problem a lil while ago, and somehow it was my front right wheel not alligned correctly, and brought it to a shop and fixed it, and its back to normal

 
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Bad alignment will never cause a vibration, it's in the tires, hubs, rotors,drive axles, and wheels.

 
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mine did that and i just got 2 new tires problem solved

 
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yep i needed 1 new tire and got my tires balanced everything is fine now

 
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Flat spots on the tire can cause vibration too.