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Re: What is this?????
It is not uncommon to get valvetrain sounds you never heard before when it was stock. Especially with Extended Range rockers or even high ratio roller rockers due to the increased lift and mechanical changes. I don't get any chattering but a whirring sound with my SLP 1.8 roller rockers. The UIM Plenum HV3 insert and CAI shouldn't cause any mechanical noise but obviously you will hear the intake system when accelerating or hitting the throttle.
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