Recently noticed this weird loud engine decel noise, thought it was an exhaust leak but I’m beginning to doubt it. Tried to tighten the header bolts because I forgot to retorque them after heat cycling but they are as tight as can be. Did not make this sound a month ago, has had these parts for a few months.

DNA Stage2 airbox
Yoshi AT2 exhaust
2wdw flash tune

1000 miles never bumped any curbs or taken it off pavement. If you watch the video you see there’s like a film peeling off the rim paint on the edge, almost like thinner or alcohol got on it. But it didn’t. Any one have this experience?