I installed Capristo Exhaust brackets a while back with the goal of preserving my stock exhaust manifolds. Although since I have been hearing a very annoying rattling/vibration noise which I have a pretty strong suspicion is coming from the Capristo brackets, as I never heard anything like it back when I still had the stock exhaust brackets. I don't hear it when I accelerate or have my foot on the gas, but as soon as I take my foot off the gas and let the engine wind down and the RPM's drop, I hear this annoying high pitched buzz or vibration behind me. For the lack of a better description, almost a kazoo like sound. And then once the engine winds down, the noise stops. Has anybody else with the Capristo brackets experienced this type of rattle/vibration? I am wondering if I need to tighten the bolts which compress the springs? But then that makes me wonder if I tighten them if that would defeat the purpose of allowing the bolts on the brackets to slide to allow the manifolds to expand and contract? Any opinions or advice is appreciated!