The drone completely gone.
I’ve had my new exhaust on the car for a while now and it has settled in and sounding a bit deeper than at first.
Maybe the best way to describe it is that it works the same way as the Akrapovic BMW X5M (mine is similar to the picture on their website) and probably the same as their 1M although I haven’t yet seen a picture of that.
The difference in mine is that the valves are actuated by the turbo boost and not electronically. This means that when you put your foot down a bit the valves open and the exhaust flow by-passes the back box and exits straight out through the outer two tips and the noise is brilliant. Normally the flow goes through the rear box and actually is slightly quieter than standard but certainly deeper with wuffles and pops.
The other difference in the system is the two secondary cats have been taken out and the centre silencer replaced by one slightly larger. Instead of a single pipe exit from this new centre box there’s now two pipes back to the rear. They said the size of this box is optional according to what noise levels you’re looking for.
This was made by BCS Automotive who are based in St Helens and the four hour drive down there from Perth was certainly worthwhile. They've got a video
www.bcsautomotive.co.uk
My insurance people said ok and no extra premium and that was a surprise.
Dealer knows and not bothered.
So, relatively quiet when I want or WTF if I feel like it.
All this and no drone - happy me. Great outcome.