The best replacement for blow off valve is wastegate.

The best alternatives to blow off valve are rated as following:

★★★★★	wastegate
★★★★★	diverter valve
★★★	bypass valve
★★	dump valve
	external wastegate
	no blow off valve
	bypass

Your alternative for blow off valve is not listed? Suggest!

Speaking about blow off valve, one probably shouldn't forget about supercharger.

Other search terms related to blow off valve and their ratings are:

★★★★★	supercharger
★★★★	turbo
★	procharger
★	non turbo car
★	automatic

You have in mind a companion for blow off valve and it is not yet here? Propose!

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blow off valve

wastegate

diverter valve