Not sure if Inter can beat Bayern away... Although Bayern have not been playing very consistently lately, but they are stronger, more technical and younger than Inter's players... Even judging by the way they defeated Leverkusen in two matches and did not concede a goal you can think about their win... Of course Inter are also playing well, especially at home, but in Bayern I think they will not win...
The first leg is Bayern home, Inter if they do want to get on the easy part should strive to play tight while away, getting a draw against Bayern on the first leg is more of success than losing, the objective of that first leg match should be either a win or draw, i rather since they have solid defense they can play more defensively, limiting the goals scored by Bayern if they will since it's home for them. I can trust Inter's defense to the job, but who dares stops Bayern's attack, any team can get lucky on the first game, but Bayern gets to be the preferred on that day.