Just received my Esc Cos back from a full nut & bolt resto.. and I can honestly say I wish my first post was showing off my new car to the community and not seeking answers to a frightful issue!

As the title suggests, my car is making a deep growl at around 3,700 rpm that can almost be turned on and off with the accelerator playing around at that rpm.

The car is booked in with a reputable company to have the issue investigated but, unfortunately it still means a degree of disassembling the engine.

Does anybody have any expertise with this or a similar issue ?

cheers guys