i removed my ipe exhaust so i can take it to my dealership peacefully and it never happened again, it seems to be it was from the vacuum source pipe that was attached to ( orginally closed before installing it it was closed with a plug ) vacuum source which is located near the wastegate.
now i'm waiting for IPE to help me fix this issue that wasn't expected from high quality and expensive exhaust.
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Docrace 6266
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