Quote:
Originally Posted by solstice
Yeah, not sure why if the low level of tune of the N54 ( 8.8 psi boost vs the 18 psi of the S55 ) has anything to do with it.
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It's definitely not the boost. My N54 was tuned to 15 PSI of boost and the only thing that changed the exhaust note is my BMW performance exhaust. Without the exhaust it sounds like a standard N54.
N54is models had their own upgraded exhaust over the stock models. The N54 actually sounds similar to the S55 with that PE exhaust and that's probably where they got the inspiration for the S55 exhaust. The change in baffling in the exhaust is my guess to the sound difference between the N54 and S55.
The burbles, or farts as some of us call it (idk why I love the burbles lol), are from the tune (overrun values for fuel trim are changed) although the exhaust can cause a few small burbles (my PE added a little burble)