"I am hoping Simon can take away some of the unknown about Racing and give us a clue as to how they play and what makes them tick," said Howlett.
"Racing are pretty unpredictable, but pretty dangerous. It is going to be a huge occasion for us playing at Stade de France.
"We have talked about the game and we will be concentrating pretty much on our own game in the build-up though Racing have huge strength in depth."
Both teams lost their last matches, 2006 and 2008 Heineken Cup champions Munster 30-21 at Leinster while Racing, seventh in the Top 14, will be determined to bounce back after their 16-12 home defeat against Montpellier last weekend.