use the oem maf rubber turbo inlet, oem maf sensor, oem style air filter or dry paper element, on the OEM turbo.
boost least test, be sure to test the area between the maf and turbo also, then tune up, oem ecu, oem injectors, clean the injectors/tube/maf (part of tune up)
thats the best it will get. you must not have one or more of these items. What is happening is the air is moving sluggishly because you have altered the inlet path with larger diameter plumbing, slowing velocity and reaction time of the maf hotwire. Either that or it needs cleaning/has a leak, as above, or the fuel pump is weak
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