Thanks for the heads up, man! I will keep an eye on it. I thought my main concern was those countersunk bolts coming free and getting sucked into the engine. Now it's how much stress the arms may be putting on the throttle body. I used blue loctite on the bolts to the support arms and they are as tight as I can go without stripping hex head. Instructions tell you to use blue loctite on the bolts into the throttle body too (which I did with some hesitance because it makes for a hard time next go). But I figure I will get a few thousand miles out of this before I have to disassemble. knock on wood. As for engine vibration, all these parts bolted together should be shaking in the same direction while engine is running. So nothing is pulling or pushing against itself (in theory)