Garage hrs catback exhaust (comes with resonator).... What are your thoughts performance wise?

I know they are extremely rare to find because of lack of production.... On the dyno do they flow as well as the invidia n1 and ams tbes? And they sound similar to those? I mean Im a newb but questions never hurt. thanks!

 

not sure, but i went with the ebay exhaust paid 300 shipped and didn't have a problem with fitment and it sounds good