At the Autodromo Enzo e Dino Ferrari, the Peugeot duo beat the other 908 of Stephane Sarrazin and Franck Montagny, with Audis taking the third and fourth places.
Three weeks after the Le Mans 24 Hours race, Peugeot took a mini-revenge over Audi, who won that race.
By taking the top two places the French constructor added to May’s 1000km of Spa sweep in Belgium.
Starting from pole, Bourdais and Davidson dominated to win by over a minute from Sarrazin and Montagny.
In third came Marcel Faessler and Timo Bernhard, while Tom Kristensen and Allan McNish were fourth.
1. Bourdais (Peugeot) 220 laps
2. Montagny (Peugeot) +1:08.688
3. Bernhard (Audi) +1 lap
4. Kristensen (Audi) +2:634
5. Boullion (Rebellion Racing) +7 laps
6. Prost (Rebellion Racing) +8 laps
7. Collard (Pescarolo Team) +13 laps