S550 Whipple Pulley Size

[TRQ]

Hello,

I have a 2015 Mustang GT, with Whipple supercharger 2.9

Full exhaust system with Cats.

The current SC pulley on it right now is 3.75 in.

Now planning to delete the cats and go with off road pipes, and change the SC pulley.

Any certain suggestions for the pulley size, and if possible, what will be the estimated boost and power with the 3.5 in and the 3.625 pulley.

Also, see many guys upgrade the oil pump shaft, is that something i should worry about!

Thanks