I can't seem to find any anecdotes of people using them. They seem to be equal length like the Z1 shorty headers for a 3rd of the price, and they still retain the VHR and HR flanges.
I like how my 09 Z currently sounds with the berk testpipes, which is the model year that had equal lengh exhaust manifolds. Thus, I feel these headers fit nicely with my goals if they are indeed equal length.
https://www.isrperformance.com/isr-p...vhr-350z-370z/