Ah, the growing pains of a new Brand.
We do not sell knock off products, period! I have been in the industry over 9 years and the it is still one of my biggest concerns. Especially having roots with a company like (TurboXS) now our exhaust components manufacturer.
These particular racepipes were developed on my 07 350Z HR (in 2007). Just so happens to be the same for the 370z.
As an actual Z owner and lover. I am fan of the VQ's raspy note, some like it some don't. It is part of the VQ character, resonating test pipes don't remove the rasp, it is more like a reduction. It's still raspy and it still has the coast down hiss albeit not as loud. Pick what you like and what is in your budget.
Thanks,
Jermaine
Sales@garageline.com