[spinjockey]

Agree that if you are seeing debris in the filter you should address soon.

Your 997 has Variocam plus and the boxster only has the original variocam. The result is a much more tuned response across the rpm range in the 997 compared to the boxster which doesn’t come on cam until 3000 rpms or so. BTW keeping your rpm’s low increases chain wear because of increased chain contact with the pads at low rpms.