Hi, I’m trying to describe the problem for you. I build the Silencer and then drive about 5 minutes, it starts to hit under the driver and driver’s seat and crash, it vibrates right. The noise pulls up 1-2 seconds. It only occurs when I suddenly turn up, switch down and let the clutch come a little faster, if I insert the backward passage and 2-3 meters back. The problem only occurs MIT!! Silencer, without I have no noises. As I said the noises only come after about 5 minutes, when the car is well warmed up. My friend has then laid down on the ground and looked back from below while I drove 1-2 meters backwards. From the outside there are NO comparable noises to hear! Just like the normal sound, no crashing nothing. Now my guess: Through the Silencer, the system vibrates densely in the case of degenerate actions, that the cat might hit the heat shield… Oh, I can’t imagine that, Alex had the same problem?