Power obsessed Turbo customers looking to push the motorsport envelope a little harder would best benefit from the larger 82mm “Competition” IPD plenum fitted with a factory 997 GT3 82mm Porsche throttle body (additional purchase required). The larger 82mm intake opening allows for even greater air flow to help optimize the more extreme mods such as larger turbos, intercoolers, Y Pipes and more aggressive software. This larger version Plenum is also designed to perform with the higher flowing IPD “Y” Pipe.