This will undoubtedly be moved to the performance forum.
There is an active thread discussing your very question.
The short answers are, "yes," and, "yes." But the valve needs to be modified, and may not work in all situations.
SaabCentral forum the most comprehensive Saab resource on the internet. Join our discussions on the Saab 9-3, Saab 9-5, Saab 900, Saab 9000 and all other Saab models, choose your forum.