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Del Stator:
If you do a test and see that the air box cover no longer sucked down when you remove the silver intake air tubing, then try also to close one hole completely so you only have one open 4 inch hole into the airbox and see if it is drawn together now and with only 500 hp, for then there the risk that it makes it also at 1000 hp but with both 4" holes open.
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Do not do this. IIRC, I seem to recall my airbox being divided inside, with each side of the airbox feeding one turbo. If you block one side entirely, you will starve one turbo entirely. This could be bad.
Do not do this. IIRC, I seem to recall my airbox being divided inside, with each side of the airbox feeding one turbo. If you block one side entirely, you will starve one turbo entirely. This could be bad.
Are you sure it is divided inside ?
Is it the case then it will obviously not work, but I do not remember what it looks like inside the airbox.
EDIT
Yes I found a picture now an it is divided
So I have changed my text above now to another test you could try.
RS6/S8 engine, 6spd tdi 01E, EFR7163 turbos, custom built exhaust manifolds, S8 camshafts, MaxxEcu Pro, wagners ic's, bigger fuel rails, AN8 fuel line, 2xwalbro 450lph fuel pump
and EV14 1500cc fuel injectors in my S8/RS8