And I would NOT say his downpipes are better since yours have full 2" pipinging coming off the turbine and I think Ash's uss 1 7/8" later sleeving into 2".
It remains to be seen how / if these things I am mentioning will affect his top end. FWIW, Ash's goal has never been top end to my knowledge but great spoolup and good power (ultimate street Z). I think we can all agree he seems to have accomplished that goal very well (that is until his exhaust mainfolds start cracking - something he is expecting).
m a g l i t o Build up COMPLETE break-in in progress NOW sig photo by me effects by ZXRider(SoCal)