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I don't understand why everyone thinks they need bigger BOVs. Bigger valve means they can blow off more air, true, but at the expense of response time. The first boost spike (as soon as the throttle plate closes, before there's much vacuum change) is the most harmful - you're going to get that regardless. The only reason you'd need a bigger BOV (like a Greddy type R/etc) is if you had a bigger turbo pushing a ridiculous amount of air - and all the big turbos have anti-compressor-surge housings.
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