Originally Posted by Jason_86_951

Another wierd thing that can happen during clutch changes is the one of both of the exhaust hangers could be loose. The S2 I had, had a serious shudder when downshifting into 2nd without rev matching. Turned out that the (2) hangers were detached and it was the exhuast causing the shudder/vibration. After reattaching the hangers, it was as good as new.

Just one more thing to check.