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RIP_MKVI
This is a good thread with combined links, videos and prices thanks for putting it together!
Dinan also is in development right now although it hasn't been released and I know many people also opting for gutting the stock muffler and modifying internally to get it sounding like the M Performance.
You have vids for many above which helps people when searching for options, I loaded this one yesterday to my other thread you might want to add to you first post.