As per the Magnis Moss Warrentey Act, the presence of a aftermarcket part can not void the warrenty. The law states that the manufactuer has to prove the the after markect part in question is the cause for the failure. But the delership will say your warrenty is void, and so will Ford. Take them to court, you will win, and they'll fix your car, unless the after market part is at fault. Auto Manufactures save MILLIONS of dollars deniying warrenty claims due to after markect parts to the thousands that don;t know any better, then they do by paying a settle ment and fixing the FEW that take'em to court. JFYI
BTW, yea, I'm aware I can;'t spell or type worth shit. Who cares.