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Originally Posted by xsperf
so a wastegate is like a boost controller? then do all turboed cars have blow off valves except some are louder than others?
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A boost controller can be used in conjunction with a wastegate, to run MORE boost. No boost controller means you'll running whatever boost level the wastegate spring calls for. Installing a boost controller will allow you to run more boost than the wastegate spring (but not less).
A turbo car will either have a blow-off valve (whooosh sound) or a bypass valve (virtually silent whiskkkk).