I did some playing around with it today. With the truck in neutral there is no vibration regardless of rpm and programmer level. When driving though there is only normal intake noise with the gryphon set to stock and a slightly louder with it set to tranny only, but in 87 tow it howls whenever there is load on the engine. Cruising along there is no abnormal noise but if you accelerate or even go up a small hill with the cruise control on it makes enough noise that you have to raise your voice to talk. Im still not sure if it is coming from the intake though i think it must be because the noise was very subtle until I installed the cai.
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