I ordered a few sets of the Alibaba longtube headers.

I plan to do a design comparison later this month. I have a friend who currently has ISR headers (with dyno numbers) and is willing to let me install these headers and dyno to compare.
I'll add more information to this thread when I do the comparison.

Here are some pictures of the Alibaba headers vs ISR vs and OBX v2.
The alibaba headers have a nice spike collector where as the ISR and OBX don't.

I previously did a comparison with Speedzone vs ISR vs PPE (HR version), last picture.

 

I just realized the Aliabab headers are a Fast Intentions replica.

 

Headers would be an easy item to duplicate and a difficult one to patent. Recall that materials and labor costs in China are far below anywhere else in the world and many of the folks building these copycat products are engineers.

As such, I personally would take a chance on a product like this once I can get past the ethical argument.