They make one for 4150 and one for 4500. It’s more or less a 1” spacer that’s an adjustable restrictor plate. When I installed it on my car and left it wide open the car ran the same as it had with a normal 1” spacer. I have the 4150 version so I would think the 4500 version would be the same. Only takes a few seconds with a 1/2 socket to adjust the restrictor plate.
