Mine always does it on start up and a few other members as well have the same thing occur, I cant for the life of me remember what Wisby told me it was but it's not cause for concern whoever if you are worried about it just call your tuner or a workshop that tunes Autronic for peace of mind.

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221.7KW-ATW 498.5NM MMS ROLLER DYNO & BUILT BY STi NINJAS, BUILD #318/600

EBISU SUBARU, SHIBUYA-KU TOKYO