Can anyone tell me which tuning company produce sway bar for slk 55. Thanks

can anyone help me pls

I don't think we need to up grade the sway bar for the SLK 55, since the original one is pretty strong enough!!

No aftermarket brands I have seen for the AMG version. Since you have the 350, perhaps upgrade to an AMG version - but not sure if there is a difference. I suspect the front bar will be larger to cope with the extra sway due to the weight of the V8.

Let me ask a dumb question. Why do you just want to change the front sway bar?
Making the front bar stiffer will cause your car to push more (= understeer more). Changing parts or settings on the suspension should be done at a track where you can test the result and tune it to where you want it. AMG did this to the CLK55.
If you want a change in handling characteristics, I would recommend you buy an entire "package" (front & rear sway bars, stiffer springs, plastic fittings instead of rubber, etc) that has been developed and tested with your model car. Just changing one part will not have the effect you desire.

Sorry guys....forgot to update my profile. I traded in the 350 to the 55. Apparently the 55 install the PSS9. 19" wheels with potenza 01R.

I was not suggesting to just change the front bar. Only implying that the front bar is perhaps the only difference between the 350 and 55 models.

Heman, you may get your desired results by simply going with coil overs (I cannot tell by your last post if you already have PSS9s or not...).