Roush: I Feel a Great Responsibility (Grand-Am)

[NewsSource]

Full Story... (http://www.grand-am.com/koni/news/index.cfm?cid=18359)

[CPViolation]

I've been trying to pull-up specs on Grand-Am cars.
The Mustang has been doing well on short twisty courses which has surprised a lot of people. Also decent tire and brake wear.
Hmmmm....
My questions are:
Are the Porsche's and BMW's crippled with weight, displacement or restricted intake?
Jeff