I installed resonated isr test pipes and I think all the nuts and bolts are tight but when I get off the gas and it gets to the 2,000 rpm it’ll make a loud rattle noise. It sounds like it’s coming from around the test pipes. Could this be a heat shield some where around that area?

 

are they resonated test pipes? when i put ART pipes on mine, they were real close to the drivers heat shield so i took a pry bar to bend the shield some

 

yes they’re resonated.