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I only knew of one replacement, and it was part of the HKS twin-charging kit. No need to replace it though. It either works or it doesn't. If you don't get boost or don't hit target boost, it needs work/replacement. All it does is allow air past the SC when it shuts off, and prevents overboost, which is very rare. If you install a larger crank pulley, you can perform a vacuum routing change that will raise the overboost release pressure, but it doesn't really give any gain to a stock setup.
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