Solid motor mounts for a street car.

[StangFlyer]

I've seen people do that before. It depends on the blower bracketry. The design of these blower brackets, their material, and thickness vary between manufacturers, and on some of them over time they can flex out of shape. So, doing that basically anchors it to the chassis to add extra sturdiness and strength to prevent flex. But, if you already have solid engine mounts then I wouldn't think doing that is going to increase noise and vibration too much more than the having solid mounts themselves.

However, if I were you I'd call Procharger directly and talk to them about what you are doing, and about the strength of their brackets. See if they feel doing that is required to keep the brackets from flexing or warping out of shape over the long haul. I know that did happen sometimes with the Procharger setups years ago, but I am not sure of their bracket design currently and if they've updated it all over the last few years. I run a Paxton NOVI 2000, which has some serious brackets and that sort of thing isn't a problem.