Originally Posted by tiger123

I installed the Berk CBE one year ago in April 2013. I just installed the Berk HFC's this past Sunday 4/13/14.

Upon start up right after installation, I noticed severe vibration and noise coming from underneath the car. Upon further inspection, the Mid Pipe was was barely resting on the Cross Member. I adjusted the Mid Pipe so there was additional clearance from the Cross Member. Started her up and all was good with the world.

Man, these these things are off the charts. The sound, acceleration and pull is fantastic. I'm really impressed with this setup.

So flash forward to today. I start up the Z and I could hear a slight ringing. I gave it some gas and the vibration was back. I took it out for a little drive and the vibration noise was back in full force. It was there upon acceleration or deceleration, not so much when cruising. Once warmed up, the vibration sound disappeared. So it appears this vibration happens when cold.

So I drove it home and took a look underneath again. Everything appeared to be really tight. Clearance from the cross member was sufficient, or at least from what I can see. I checked all the hangers from the Mid Pipe back and again everything was really tight.

I'm perplexed at this point and do not know what could be causing this. Looking for guidance from this forum if anyone else experienced something similar.