Join Date: Mar 2014
Location: France - down by the Spanish border
Vehicle: 2014 SLK250
Other Toys: RS3, MacanS, MGBV8
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If you have vibration in the steering at certain speeds only, is due to something out of rotational balance on one or both front hubs. Look nowhere else if this is the case. Vibration through the seat indicates the same, but at rear.
Steering damper is only there to absorb road surface variations. It will NOT mask any balance issues. Sort out the balances before you spend unnecessary money on this.
Engine mounts, as already said, will be evident at all times, increasing with speed.
MAF will not affect handling, so you can rule this out.
'Tramlining' as a rule of thumb can be due to too high a tyre pressure, oversize (or undersize) tyres or geometrically altering the centre spot of the wheels - eg using spacers. If you also have poor self-centering steering, then I'd ask if you are using spacers. Then there is the alteration of kpi, caster and/or camber. It goes on…