Dortmund, eight points clear of Bayern at the top of the Bundesliga, can wrap up their second successive league title on Saturday with two games to spare with a home win against fourth-placed Borussia Monchengladbach.
Kahn was particularly impressed by the way Dortmund defender Never Subotic ran up behind Arjen Robben and shouted at him after the Bayern's Dutch winger missed a late penalty in last week's match between the two sides, which Dortmund won 1-0.
"That is exactly the kind of mentality you need, it expresses the unlimited will to win," Kahn told Sport Bild magazine in an interview. "It says: 'I want to win the title at any price.'
"What is striking for me is the hunger for success and the huge identification that [coach] Jurgen Klopp and the team have with the club," Kahn added.
"I have my doubts whether the Bayern players can deal with that defeat positively, and that they may lose a fifth game in a row," he said.
The low point came when he aimed a flying kick at Dortmund forward Stephane Chapusiat, bit Heiko Herrlich on the neck and pulled Andreas Moller's ear during an action-packed match in 1999.
Kahn added that Dortmund's presence could benefit Bayern in the long term.
"Competition means that you are always being asked questions and that you will never be allowed to get sluggish or lazy," he said.
For the second season running, Dortmund's young team, orchestrated by their charismatic coach Klopp, have taken the Bundesliga by storm with their intense, non-stop, physical game.
