I just had my 2004 rx8 for a month and it has a vibration at higher speed which i can feel in my steering wheel but not shaking more vibration. I had all wheels balanced and 1 bent wheel replaced and problem is still there. My friend just told me there was a recall for balljoints for my year so I'm gonna check into that.
U guys have any clues what it could be??
Thanks in advance

 

The 3 common reasons could be...

1) Alignment
2) Wheels out of balance
3) Locking lug nuts

...hope this helps

 

Any update on what it was. I am having a similar problem. At low speeds it is almost unnoticeable. But at higher speeds and turning there is a deep vibration. Any help would be greatly appreciated.