Dealers cannot void your warranty. They can deny a warranty claim. In order for them to do that, they have to be able to prove that the aftermarket part could have reasonably caused the failure. Having a warranty claim denied due to a cat back would be pretty unlikely.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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