I realise your question was posted 2 months ago but as others will hit this post when searching the same topic...........
To my knowledge NO ebay dumps have EVER fitted an MX83
That is not to say that you should not purchase EBAY dumps.
All the 1j cars ie jzz30 soarer,jz this,jz that, were the same up the top of the pipes ie the turbos are a set distance apart and the ports are always the same shape SO
any 1jz dumps from anywhere will fit between the turbos provided some quality control is included in the purchase price.[some use 2 factory gaskets,some only one]
the pipes then travel down HOT side of motor and run into the steering axle.Also the engine moves under torque loads and the steering gear does NOT.
So sometimes its worth buying the cheap pipes and chopping them 100mm down and allowing your local exhaust shop to pick up the flow from there,that way they have not had to purchase flanges etc etc etc
as you all most likely know the cats are the most likely flow [horsepower] impediment so run a twin system with two cats,join back to single before or adfter the diff and run the rear muffler in standard posi.BTW cars that dont alter the rear apron to match the exit pipe posi look unfinished.
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