I recently replaced the motor mounts in my 79 244 DL and I destroyed the metal tube that takes air from the exhaust manifold and goes up under the radiator somewhere (I just took a quick glance). I am guessing it has something to do with the EGR valve. I need to replace this tube, but I don't know what it does or what it is called. I am thinking for a quick fix I could just get some of that metalic tape and wrap it around it real tight and grab one at my local pick-n-pull. Just to be safe I am going to plan on replacing the entire tube. Any help would be greatly appreciated....

This also brings up another question for me...when I first started driving the volvo its EGR or EGX light was constantly on in the dash cluster. I never looked in to replacing it, but am very confident I am able to. Instead I just unplugged the wire to the light on the back of the cluster. What are the symptoms of a bad EGR valve? Does it only affect smog? or Does it affect the perfomance of the engine? I hope I didn't damage anything....Thanks again.