4 0 0 0   r pm . ▁ ▁In ▁ 2 0 0 1 , ▁Ford ▁added ▁In take ▁Man if old ▁Run ner ▁Control ▁( IM RC ) ▁to ▁the ▁V 6 , ▁increasing ▁the ▁engine ' s ▁output ▁to ▁ ▁at ▁ 5 5 0 0   r pm ▁and ▁ ▁of ▁tor que ▁at ▁ 2 8 0 0   r pm . ▁During ▁the ▁second ▁half ▁of ▁the ▁ 2 0 0 4 ▁model ▁year , ▁the ▁ 3 . 8   L ▁Es sex ▁was ▁replaced ▁with ▁the ▁ 3 . 9   L ▁O H V ▁Es sex ▁V 6 . ▁The ▁ 3 . 9   L ▁had ▁a ▁slightly ▁longer ▁stroke ▁but ▁output ▁for ▁the ▁engine ▁remained ▁identical ▁to ▁the ▁out going ▁ 3 . 8   L . ▁The ▁ 3 . 9   L ▁Es sex ▁was ▁used ▁in ▁the ▁Must ang ▁for ▁only ▁half ▁a ▁year ▁before ▁being ▁replaced ▁by ▁the ▁ 4 . 0   L ▁C ologne ▁V 6 ▁for ▁the ▁ 2 0 0 5 ▁model ▁year . ▁ ▁Must ang ▁Cob ra ▁( 1 9 9 9 , ▁ 2 0 0 1 , ▁and ▁ 2 0 0 3 – 2 0 0 4 ) ▁▁ ▁The ▁Cob ra ▁model ▁returned ▁for ▁ 1 9 9 9 ▁with ▁its ▁ 3 2 - val ve ▁ 4 . 6   L ▁V 8 , ▁now ▁r ated ▁at ▁ ▁at ▁ 6 0 0 0  