I've moved this to the sticky because its a much broader question than one product. This is constantly being asked and can be confusing. Here is how this works and if someone else has better info, please post.Today the local Porsche Club of America chapter had their monthly tour. The President runs a Macan S with Cobb Accessport which was installed when brand new and the car now as 32k+ miles. According to him, Cobb Accessport tuning does not void the Porsche warranty as Cobb developed the Accessport tuner in conjunction with Porsche. That's news to me. No other tuner can make this claim? I intend to check this out with the local service manager. Is this true? If so, I know what I'm getting for Christmas.
You, as a US consumer, are protected by the Magnuson–Moss Warranty Act. The essence is that consumers are not required to use parts made by whoever made a product. This is not specific to cars, its anything. Read this about electronics. https://motherboard.vice.com/en_us/article/gv5ddm/warranty-void-if-removed-stickers-are-illegal However, its a two way street. If what you do messes up something, then its on your dime. This is discussed endlessly, over and over again, mostly in auto forums. How many people mod their lawn mowers?
Read your WARRANTY. What does it say?
Read the first reference in this thread from the FTC https://www.consumer.ftc.gov/articles/0138-auto-warranties-routine-maintenance
Read the actual MM act [USC04] 15 USC Ch. 50: CONSUMER PRODUCT WARRANTIES
and most of all, read the voice of experience: https://www.macanforum.com/forum/engine-technical-discussion/34906-official-will-void-my-warranty-discussion-debate-thread.html#post1832481
In practice, from what I've read and experienced, you break it, you fix it. There are countless threads on this all over the internet, people complaining "but but ..." From what I understand, what breaks has to be relevant to what you changed. But here's the big thing and relates to this post above. Car makers are VERY VERY Big with lots of experience in handling these things. You are very very tiny. I've looked for cases where car models fought using MM. Its rare they win. It does happen. But is it worth the aggravation, the time, effort, fees?