Going to take a crack at Index racing next year

moparstud440 said
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.
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My intake manifold is pretty tall, (Mopar drag pak) I don't think I have the clearance on the top to add an additional 1", plus some tracks or racing series may not allow a restrictor plate, but they can't say anything about how I tune my car. Going to try taking 5 degrees out next time I can get to a TNT night.