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Jerome Boateng pulled Bayern level with a headerBayern reach fourth consecutive semi finalHosts take 27 minutes to overturn two goal deficitBavarians' treble dreams still alivePorto improve after woeful first halfBayern Munich put in a devastating first half performance to overcome a first leg deficit and beat Porto to reach the Champions League semi finals.

Needing a 2 0 win, Bayern were level on aggregate within 22 minutes thanks to Thiago and Jerome Boateng headers.

Robert Lewandowksi put them further ahead and cheap nfl jerseys Thomas Muller drove home for 4 0 before Lewandowski added a second.

Jackson Martinez gave Porto some hope, but Ivan Marcano was sent off, with Xabi Alonso scoring from the free kick.

The result was a boost to the reputation of Bayern boss Pep Guardiola, who was in danger of suffering a Champions League humbling for a second consecutive season.

Since the Spaniard took over the reigning European champions from Jupp Heynckes in 2013, they have dominated in the Bundesliga, losing only four of 63 games.

But they were were beaten 5 0 on aggregate by Real Madrid in last year's semi finals and looked like they might struggle even to reach that stage this time following a 3 1 first leg defeat in Portugal.

Guardiola had reached the Champions League last four in all five seasons as a coach of Barcelona and the German club.

And Bayern chasing a second treble in three years were Cheap Jerseys nba jerseys china confident of making it six. Captain Philipp Lahm was "utterly convinced" the Bavarians would qualify, although Muller warned "everyone just piling forward would be suicide".

But, cheap jerseys in effect, that is exactly what they did.

Bayern attacked from the first whistle and Lewandowski had hit a post before Thiago headed home Juan Bernat's cross to open the scoring within 14 minutes.

BBC Radio 5 live's Pat Nevin at Allianz Arena:"Bayern were ruthlessly efficient in the first half. They were brilliant, scored great goals against a poor team. But they made some tactical changes and looked bordering on anaemic in the second half. They didn't look up for it. They could have been pulled back in the end but there's more to come from this team."

Boateng levelled the tie when his seahawks jersey seemingly weak header from Holger Badstuber's flick on beat Fabiano.

Five minutes later, Bayern strung together 26 consecutive passes as Lahm's cross was helped on by Muller and Lewandowski stooped to head home.

Porto boss Julen Lopetegui had identified that most of Bayern's threat was coming down the left despite the absence of wingers Arjen Robben and Franck Ribery and brought off right back Diego Reyes after 33 minutes.

But the change did nothing to alter the flow of the game. Muller put Bayern in control when his shot from long distance was deflected through keeper Fabiano's legs by Bruno Martins Indi.