Originally Posted by bullitt5897

There are several reasons why they are going cog:

1. Simpler pulley setup
2. If you break a supercharger belt you only break the supercharger belt not the serpentine belt. Meaning you can limp the car to get a new belt or off the road.
3. Better grip than a 6 rib
4. Scalability!
5. Cost savings

Why are they making their own pulleys?

Well they are making them for this specific application. Why is it an issue? It's not that loud and it's perfectly fine for street driving.