Took my car into the dealership today, I'll let ya know what happens.

I know this topic was discussed quite some time ago, but i have had the exact same problem, a leak on the drivers side where the fabric meets the plastic on the top of the pillar between the windshield and the driver window. How did the dealer ever fix this? I'm taking mine in next week.It has leake...

It's a device called a cam phaser which is located at the end of the intake camshaft, that's what changes the valve timing to eliminate overlap between the intake and exhaust valves, kicks in between 3-4k, cutting down on overlap mean more performance and better economy.

I confirm the rev limiter, i'm an engineer at gm and owner of a GT, same thing happened to me one day. I confirmed with someone who is familiar with that engine, the rev limiter will kick in at around 6k until the engine is warm enough to prevent long term damage.