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sw20kosh · 06-05-2013, 07:35 PM

Sounds like you have an exhaust frequency at that RPM that is vibrating something like a heat shield or a loose bolt or etc. It is probably the exhaust considering that is what you changed out.

06-05-2013, 07:35 PM	#3
sw20kosh Senior Member Join Date: Jul 2012 Drives: 2013 Black FR-S Location: SF Posts: 3,030 Thanks: 881 Thanked 2,014 Times in 990 Posts Mentioned: 153 Post(s)	Sounds like you have an exhaust frequency at that RPM that is vibrating something like a heat shield or a loose bolt or etc. It is probably the exhaust considering that is what you changed out.