Muffler/catback questions (tried search)

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My list of questions:

1. Of the following mufflers, which ones can be installed on Mark 8's with a stock exhaust system?

A. Borla XS
B. Borla XR-1
C. MAXflow
D. Magnaflow
E. Dynomax

2. Assuming that a high performance muffler is installed, how much more power can be had by installing new pipes (cat-back)?

Thanks for any assistance you can provide.
 
RE: Muffler/catback questions (tried search)

I think any muffler can be welded to the stock exhaust by a decent muffler shop? The stock MK8 exhaust is very restrictive anything you do to it will help.
 
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