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Hi,
actually the version of NBT doesn't really have any impact to sound quality.
I upgraded my 335i with DLS UP4i front speakers, Earthquake SWS-8i subs, added JBL MS-8 to drive everything else than Earthquakes which had Mosconi AS-100 highend amplifier. This sounded very good even compared to my X5 which has B&O. 335i had HiFi option which has a big benefit, i mean the audio signal to original amplifier is a line level signal. This setup could work well in x5 as well. I kept the back seat speakers stock as I use to bias the audio to front speakers.
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