No boost. Lots of back pressure. Help

tdi heed

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can any 1 help i have 1.9tdi(awx) the oil seals went last week so i sent it away 2 midland turbo where it was re-cond. i got it back yesterday put it back on now i have no boost and lots of back pressure. it never had this problem before the turbo went. the engine has only done 60.000 miles. i have also changed the oil and filter. the engine breather is also clear. can any1 help???
 
theres boost up high in the revs but low down no response. cant explain the back pressure.