Maybe because the car was in the shop for a while and you haven't driven it for that period of time. I am guessing that passing some time, the sensation of the exhaust sounds will return.
For example, I driven a noisier NAPA truck all day years ago. At the end of the day, I hopped into my '98 Eddie Bauer Ford Explorer and it was much quieter and it felt like driving a different car unlike before work. After some time passed, the noises and sounds of my truck returned back to normal.
Or your Z4 had broken-in further as things are smoother now than it used to be. Or a different brand of gasoline was used?
Just throwing some ideas out there.
Last edited by MDLFCS; 06-27-2010 at 06:20 PM..
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