I just installed my prochamber w/CATS about two weeks. I used lock washers behind the nuts and I used a hi temp RTV gasket for the right joint from exhaust header to prochamber. I started feeling , I guess its a vibration at about 400 rpm. I also heard like a hissing sound. I put the car on a lift and see that one of the CATS has a leak, one of the welds cracked. What should I do? Any Ideas about the vibration?