Upgraded CP or DV/BOV does nothing for performance. It's a preventative mod to stop either the CP blowing off at the throttle body or the DV popping off. These are the flaws of the stock setup. I personally have only had an issue with one specific DV popping off at 14.5psi. Most people don't upgrade these parts unless they experience one of these symptoms or they install it before other power mods as a precautionary measure.
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