| I cannot answer your question directly. The reason I haven't installed yet is because I rcv'd this from Z1: "Unfortunately we have discovered a manufacturing defect with the o-ring groove in steel flanges where they mate against the bottom of the turbo. The groove was machined too small for the o-ring on this production run. The provided O-ring will probably be damaged after tightening down the flange and likely result in a small oil leak. The samples we had previously tested which were machined correctly did not have this defect and performed flawlessly. We are now correcting the problem. We ask that you return the flanges to Z1, we will machine them correctly, and return with new O-rings..." My flanges are on the way back.
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