True , you do have a point.
But a long length tube header on a turbo is a different animal . I just speak from playing with turbos on Jap bikes .
Most Turbos , in my area , liked short tubes .
Plus the collector has an influence in spool time more so ..
All anyone can do is try and test the product.
Good luck

 

Thanks Johnny when i decide I need headers i will buy and post the results wont be for a while though unfortunately