N55 with downpipe and golf tee mod satisfied all my exhaust desires. IMO it sounded amazing, and better than any other car I've owned.
PE or PE mod is great
335is rear section will provide a similar sound for cheap
VRSF exhaust is relatively proven but overpriced for what it is
AE exhaust is by far the best exhaust for n5x but is discontinued--if you can find a used one, buy it
Cobb is a cool design, my friend has one on his N55 and likes it
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