Cam assy replaced. Missing engine noise.

[cxfusion3mp]

Had quite a few problems lately on my 2010 3.8 coupe GT. Numerous check engine lights have had me in the dealership pretty much every weekend for the last two months. Got the car back today after they kept it a week this time, and they stated they replaced a cam sensor and the cam assy. On the drive home I noticed a distinct drop in the acceleration noise. The car, even when purchased and for the first 20,000 miles of use before the check engine light problems, had the guttural roar of a v8 from the early 2000's. Now with this fix, that's missing. Know it's a silly thing, but I miss it. Could the noise have indicated a problem in the first place, despite being the norm for 2 years until now? Car seems a bit stiffer now as well, but perhaps I can chalk that up to having a rental for a week.

Any chance they screwed something up? Acceleration speed seems fine. Just missing that growl.