Cat-delete or cat-back for 1.5TSI

Hi all, I'm a 1.5 TSI Manual user, I want to cat delete to enjoy the tool more, but I have a few questions.

* Can I get a satisfying sound?
* How much of a performance increase would there be?
* Will the warranty be voided?
* Does the fault light come on?
* What difference does it make if I do cat-back instead of cat-delete, which one would you recommend?

If anyone has cat-delete or cat-back done before, I would appreciate it if they share the video, thank you very much. <3
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