Procharger has been around for quite a long time, and was the first centrifugal supercharger to come with an air to air intercooler. Lots of people have made really good power with them in other areas of the car hobby. That being said, centrifugal units tend to make less power than roots/TVS style units.
For a 4Runner application where we're trying to maximize long term reliability, staying naturally aspirated is of course the way to go, but if forced induction is on the table, there's a reason no OEMs equip their cars with centrifugal units over roots/TVS style units or turbos whether it's to make power (muscle/sports car scene) or efficiency (Ford Ecoboost line.) Roots/TVS superchargers and turbos are more reliable, make more power, and are overall better than centrifugal units. If it were me, I'd get the URD/Whipple kit. Whipple is top of the line when it comes to superchargers, they actually make a compressor that displaces as much air as the 1GR-FE.
All that being said, the 1GR-FE is an open deck motor, so it's not really the greatest host for boost anyway.