I have a 2012 CTS AWD 3.6DI and have been reading many posts in here about some mods to increase HP. I spoke to a local performance shop and the guy shut me down the second I told him my car. He said the timing chain aren't able to handle it and not to change anything from stock. I tend to believe him because he just turned down thousands of dollars. However, in all the posts I have read in this section, nobody has even mentioned anything about the timing chain being an issue. So...has that problem been fixed for the vehicle I have? Is there an "upgraded" timing chain that can be installed? Also, are there any issues with the car being able to handle the increased HP and torque (I haven't seen this be definitively addressed either) and how much of each? I don't know how much I want to add, but knowing how much the car can handle will guide my decision.