Anyone noticed a " growl" lately???

[B&T's 3]

This might sound strange, but has anyone else noticed a bit more of a growl to your engine since the onset of the colder weather recently?. Hope it's not just us!.LOL. There doesn't seem to be any difference in performance or anything, just a bit more of a "growl" under accleration. Your thoughts on this are appreciated.

[stevenma188]

It's probably because the car is just not working as efficiently so it needs a wider opened throttle to get the same acceleration, hence the growl.

[Hives]

nothing to worry about. This is normal in cold temperatures

[Fuman]

It's probably because the car is just not working as efficiently so it needs a wider opened throttle to get the same acceleration, hence the growl.
the air is more dense, if anything, its more efficient (excluding engine startup)