How to tell if 263 or 304 HP
 

I have been looking at the 2008/09 CTS4s. Is there a way to tell if the engine is the 3.6 direct injection 304hp engine?

well, sometimes the 3.6's say 3.6 on the back. but they wil usually tell you whether or not it's the crappy 3.0 or the 3.6L DI.
trust me, the 3.0's aren't very powerful.