While I cannot comment on how the Borla sounds. But I would bet it is going to sound very similar to all the other catbacks for these cars, aside from Eisenmann and Meistershaft, they have more of a unique sound, the rest of the catbacks sound very similar.
The N54 exhaust will fit the N55 for sure. Also the catback from an I will fit an XI in SOME cases. Some catbacks will fit both, some will only fit an I. You need to do your research on the Borla to see.
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