as far as the bov goes, see what manufacturers make for it if any. and im assuming u want an aftermarket bov because they come stock with one. u just cant hear it because it gets recirculated into ur intake system (usually) u may not be able to vent it do to it might screw with ur maf meter if u have one. do some research on ur car speciffically cause i dont know a whole lot about volvos. now onto the boost controller. MBC is easir to install but harder to use. there also alot cheaper. EBC will alow you to control boost eletronically and not have to worry about shutting ur car off and manually turning it up or down. ur call. i have a MBC just because it was cheaper and easier to install. good luck
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