The best replacement for manual boost controller is electronic.

The best alternatives to manual boost controller are rated as following:
★★★★★  electronic
★★★  electronic boost controller
★★★  bleed valve

Your alternative for manual boost controller is not listed? Suggest!
Speaking about manual boost controller, one probably shouldn't forget about external wastegate.

Other search terms related to manual boost controller and their ratings are:
★★★★★ external wastegate
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