On startup and idle, I detect a sound from the exhaust manifold area that sounds like an exhaust leak. I've looked and felt (cold engine) for a leak w/o success. I removed the upper heat shield and inspected w/ a mirror for cracks and found nothing.

I'm wondering if maybe this sound is "typical" for the 2.5. It seems a little noisy for a luxury car. Anyone else note this exhaust sound on a 2.5L engine?

I recently purchased the car and don't have much experience w/ it yet.

Thanks