A bad engine mount will misalign and put pressure on the entire drive train which will eventually lead to a much more expensive problem.Why would you want to disconnect the speedometer, you're setting yourself up for a speeding ticket?After market chips are available for most vehicle computers that will alter a lot of pre-set conditions, but you may run into trouble when you go in for an emissions test or roadworthiness test.Modify with care, your tires are probably not rated for that speed and a blowout at 100 mph is an ugly thing....