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O.k. Sorry for the late reply. Missed this one. A catch can is used to filter the engine crankcase vapours. There is a hose from the top of the motor to the intake hose just before the turbo. The catch can goes "inline" on this hose. The EGR block. There is a plate that goes on the cast EGR pipe on the intake manifold side which blocks the exhaust gases from re-entering your intake.
But before you do this mod I highly advise you instal a dawes and needle valve first. Blocking the EGR will result in slightly higher EGT's and make your boost levels go crazy.
Blocking the EGR is the last thing you should do on the Mod's list.
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