I just had both of my U-Joints replaced on my car. They both had excessive play in them and a whole lot of noise and vibration was coming through the car. I have not got a lot of experience with this stuff, but I think the danger lies in that if the U-Joints come apart, they can take out the fuel lines which usually are running fairly close to that area, and along with that is the battery cable... so sparks and fuel... kaboom. At least this is what I was told anyway.
Does anyone happen to know what manufacturer these buckshotracefab tunnels are built for, looks like a Superformance, but can't tell for sure.
James