I think I understand where Clueless is coming from; I've owned a number of vehicles with both factory & aftermarket remote-starters. They are "secure" from theft in the sense that they still require a key. In every instance, the key must be inserted and turned while your foot is on the brake or the engine dies. (Not to mention the steering wheel must be unlocked).
However, from the perspective of a guy who has installed half-a-dozen of these remote-starters myself, JFP makes the correct statement that this is IN POINT OF FACT bypassing the anti-theft device that Porsche put in place. Wiring it so that it still requires a key is simply the option you'd take as the installer. Once it's by-passed, it's bypassed, until you wire it in such a fashion that it requires another device or mechanism to keep it bypassed.
So yes: drawing-up a schematic that would bypass the immobilizer for a remote-start DOES, in fact, teach us how to steal cars, despite the fact that a thief would still need to do the easy-part of circumventing the steering-lock.
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