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Dont do the dump valve delete with a car running MAF, Did this to my brothers STi Version 4 and it drove horrible(jerky and un-responsive) made a very nice sound(Rally car like chirp).
We used a metal bung for a couple of quid to block the pipes up to the oem re-circ as the standard plastic one broke, I would personally do it, if I was running a after market Ecu like Simtek or Autronics etc which doesn't use MAF, and a strong turbo like the TD05.