Thanks guys - I think it's a suspension issue but I also thought that replacing the front control arms would fix it, i don't feel it through the brake pedal it is purely steering wheel wobble (and if you let go of the wheel the people in the back seat can see it). I do get clunks going over bumps. I've owned the car for a year and a half and the tyres were installed as part of the purchase. They may have scrimped on the balancing or not done a proper alignment however it is quite pronounced the wobble so I suspect that I should repair the suspension components prior to getting an alignment done. And if so which ones should I start with?

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2004 E53 4.4L N62