I recently installed some bolt on items to my tC2. Tsudo catback exhaust, Injen CAI, and Weapon R header. After installing the header, there is an unusual rattle coming from somewhere, typically happens at the high end of rev in first gear
and when I get on it into second gear. It only last for maybe a second at most but to me it’s obnoxious. I’m unsure of where to troubleshoot, maybe thinking it could be the heat shielding from the stock exhaust or maybe it’s just breaking in.

Any help or advice would be greatly appreciated. I want to take it to the Dyno but not with that “phantom rattle”.