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So improve flow = same initial spike (26psi, N75f) but more controllable (no creep)?
How much more do you think it can flow Bill or is that hard to say without actually looking at the turbo? would improving flow show in maf g/s?
Can i confim something, they are porting the WASTEGATE yes? not the entire housing? Porting the housing may make the turbo flow more air, but its not going to fix your problem.
Porting the wastegate WONT let the turbo flow any more air, but will allow it to control the path of the existing exhaust flow properly and so control boost.
You keep saying "borg warner" as though its something different to the original part. Its the same company. A Borg-Warner K04-020 IS EXACTLY the same as a KKK K04-020. Bills also suggested more than once that this isnt a standard turbo due to the figures you've shown, yet you dont seem to get that...