Update. I solved my exhaust rattle. Had nothing to do with my car. I've been chasing this for over two seasons. Expensive exhaust with a zip tie in place on the arm, to secure inner flap from shaking inside exhaust pipe. Unbelievable. It's like a spacer is missing between pipe and arm. I'll take pics later... Exhaust sounds unbelievable... It's always been polluted by rattle, even at high rpms. I never realized....
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