Door seal??

http://www.piperdoorseals.com

These are the only seals I've ever had actually work well. They
reduce both noise and air leaks. Do the baggage door too, and get the
kit for the door pins to make sure that the door is properly aligned.
There are 2 side effects.
1. You have to remove the old seal completely including the old
adhesive. This is about a 4 hour job. 2. The new seal mounts on the
cabin frame and is more vulnerable to inadvertent damage. However,
replacements are cheap and easy to install. You only have to replace
the damaged section.