It's not an HKS (hangers are welded in the wrong spot, tips are welded differently)
It's not an Invidia (missing the center badge and the flanges are wrong)
Guessing it's some off brand copy that uses lower grade stainless steel.(?)
Edit:
Found it.
Spec D tuning
https://www.amazon.com/Spec-D-Tuning...3348866&sr=8-3