Put the Fortin Remote Start in my Wife's Q5. I went this route, because its only $160 all in, utilizes the factory keyfob, you don't sacrifice a spare key, simple install, and there are a ton of options that it allows you choose between.
Remote Starter Kit - https://amzn.to/3bwlXzL
Flashlink Programmer - https://amzn.to/2xuvfh5
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