Retune after doing this or not required?

Cheers,

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MY06 Pig STI
333hp/502nm

I beleive that any mods you do before the AFM or after the second 02 sensor wont require a re-tune on modern WRXs

retune by resetting the ecu

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deaded

with a stock ecu, i wouldnt think so.
with a decent ecu, you should always assume anything that may improve your power should be accounted for with a retune to make sure your AFR's dont lean out.

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Long live the WRC