turbo's + backpressure don't require each other
more than likely you may have a small boost leak
check all your clamps & intercooler pipes for splits/holes/cracks
when on hard throttle do you hear air rushing from the engine bay?
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Please use the forum to ask your questions as they will get replied to much faster than pming me 
Pics of my build.
"Good girls are just bad girls that don't get caught"
Do a diagnostic first!
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