My car does it as does my mom's brand new 328i. I will post a vid later but just wondering if belts could make the noise? On both cars the rate of the sound increases with rpm.
Whatever it is, its probably not a big deal. Dont quote me on that though lol. But between the exhaust and our noisy ass motors and with all the mechanical parts in our motor if its even a little low in oil it will make noises. I have never heard a quiet running sn95 cobra before lol. As long as the performance is there and it doesnt sound like someone is beating your engine with a hammer then its probably ok. Just my o2