[BNaylor]

Actually the subject is well discussed on AF. Try the other GM "W" and "H" body forums. That Kenco kit is OK if you do in fact have a UIM EGR problem. I don't think it is worth it for the time and cost. So you would have to confirm it is needed first and that requires removing the UIM. Most people go with the improved aftermarket UIMs made by Dorman/Motormite and APN which come with reduced diameter EGR stovepipes.

I have seen UIMs from 95-98 model GM cars with the SII 3800 engine with no EGR meltdown problems. If you do have the problem there will be internal coolant loss as a major symptom.