You're most likely getting belt slip on the supercharger side. You should see belt dust on the back side of the sc and sc bracket. You can upgrade to the Gates K080220RPM belt and PM "Z"en on the forum, he just developed an additional tensioner set up for the sc side.
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Fast Intentions "Stage Seb" twin turbo #098- Specialty Z/Tial-Xonarotor/CJM/Ecutek/HKS/KW/SPL/Hotchkis/Rohana/Toyo
700+whp
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