Greetings unvmy996,
This is Greg with IPD.
We noticed you purchased a 997.1 Turbo Plenum.
We recommend changing the one way check valves with the Turbo applications. We have an upgraded CV available.
Please contact me if you'd like us to send one your way.
Your CV may or may not be good, but it should be changed anyway because that is an older model.
You can contact me at my e-mail at
gmartin@ipdplenums.com or by phone at 714-842-5000.
Cheers,
Greg