Hi, I've had a Mongoose Cat Back on the car for about two weeks now and noticed recently it's exhibiting a slight metallic vibration around 2k revs when letting of the gas, just wondering would this be maybe like a loosened bolt? or a heat shield? I'm not to clued up though and thought i'd ask if anyone can throw some ideas's to what's most likely causing it.
as you have said sounds like something is either loose, or perhaps the heatshield/exhaust is rattling off somewhere. Best to take it back and ask them to have a look, or jack it up and have a look.
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