Federico Macheda added the third after half-time although Bayern were unlucky to have a late effort disallowed.
And perhaps Ferguson deliberately made a point by including the likes of Tomasz Kuszczak, Chris Smalling, Rafael and Federico Macheda.
Without the injured 34-goal striker Wayne Rooney, Ferguson gave Frederico Macheda his first start of the season up front with Dimitar Berbatov.
With the rain absolutely pouring down in Coleraine, Macheda did add the third nine minutes into the second half as he hammered past Pacheco.
Italian club Lazio were unhappy over United's pursuit and signing of Federico Macheda, who was 16 when he moved to Old Trafford in 2007.
Ferguson hinted that Welbeck and Macheda, who scored vital goals at the end of last season, will be given opportunities to play their part.
But Federico Macheda gave United hope with a powerful shot and Nemanja Vidic stooped to head in a Nani cross to equalise for the visitors late on.
But United are renowned for their ability to keep fighting until the final whistle and Macheda drilled in an 18-yard shot to give them a renewed belief.
Ferguson, cutting an increasingly desperate figure as he prowled his technical area, brought on Darron Gibson for Ryan Giggs and, later, Ji-Sung Park for the anonymous Macheda.
Case in point: In April 2009, Manchester United called up Federico Macheda, a 17-year-old who had never played a professional game, for a key match against Aston Villa.
Owen will add extra experience to an attack that still boasts plenty of established talent in Wayne Rooney and Dimitar Berbatov, plus youngsters Danny Welbeck and Federico Macheda.
It was the Rome-born Macheda's sixth goal of the competition.
With United trailing 2-1 with half an hour to go, Macheda made his debut as a substitute and went on to hit the winning goal in the third minute of stoppage time.
Macheda was eventually booked for celebrating with the crowd after his strike -- though he later revealed he had hugged family members -- who were in the crowd to see his debut.
And it got even better for the home side after Macheda gave the ball away and a swift and clinical Villa break ended with Albrighton slotting in Downing's perfect cross to the far post.
Macheda played a key role in United's successful defence of their Premier League title last season, coming off the bench to score the winner in the crucial 3-2 win over Aston Villa in April.
Valencia also had United's only other decent chance of the opening half after Federico Macheda, making his first start of the Premier League season, slipped the ball into his path but Robinson saved the 18-yard strike.
Federico Macheda was the teenager who came on as a substitute and scored late on Sunday for the Red Devils -- helping them to a 3-2 win after they had earlier trailed 2-1 to Aston Villa at Old Trafford.
Born in Rome in 1991 (yes, 1991), Macheda, known by team-mates as "Kiko", is a striker who developed his game through the ranks of the Lazio youth programme in Italy -- where he is considered as one of the brightest talents of the future.
Ferguson took off misfiring strikers Javier Hernandez and Dimitar Berbatov and sent on Gabriel Obertan and Macheda with his side looking beaten but they raised themselves for a late rally to earn a point that had appeared out of reach following the stirring efforts of Villa.
应用推荐