Attention this is kind of an advertising and I thought I'll share it - I think this is what I ever wanted and didn't know it existed.
I just stumbled these days upon a great offering that allows you to have online (phone/tablet/browser) access to thousands of magazine publications worldwide.
I looked at the offerings and signed up and invited 4 friends/family Members with whom you may share your account.
I am completely staggered by the pure amount of Car Magazines (they have all other niche or not so niche stuff too)
Lots of Porsche Content, lots of magazines I didn't even know.
For example Total 911, Walter, Octane, Porsche Klassik, Motor Klassik, Porsche Fahrer, Porsche 911, Houbraum etc. etc. etc.

If you want to give it a try here are two links. The first its the standard link, the second gives gives me me a free month if you sign up after your trial period.
Cost is 9,99 euro / month in germany 9.99 USD / month you can cancel it any time.


Have a look