Cobras are ok. Some people don't like them because they are loud. I have one on my 250es and it is loud but I don't mind. Performance wise it is a little upgrade, especially if you have the header pipe to go with it. You may need to rejet your carb if you used an aftermarket pipe.
As for the wobble it sounds like a bent rim or axle. Make sure the pressure in the tires are identical.





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