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  1. P

    what speed should OD engage?

    I have an 05 Explorer 4.0L 2WD which at about 48 mph the OD kicks in and RPMs drop to about 1500. When this happens a moaning sound can be heard from the front of the vehicle, espcially if I acclerate. Sometimes a faint rattling noise can be heard also. Sometimes it will stay in OD and not...
  2. P

    Free Flow muffler and/or new pipe??

    I have 05 XLT V6. I have ordered a KKM intake and will install this week. I want to open the exhaust up and my question is: Is there much benefit to changing the pipe from the cat on back from 2.25" to 2.50", or will sufficient gain be accomplished with just replacing stock muffler?
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