[submariner409]

Between here, Seville, and Northstar Performance there are enough threads on plenum replacement to fill a large telephone book. Use the Search tab up ^^^ in the blue bar and look for thread with "plenum", "intake manifold", etc.

On a 1 - 10 scale it's a 4. Just have the plenum, a new set of the proper year intake manifold gaskets, and some patience handy. Watch what you disconnect and replace it all.

If the $$$ isn't really a problem, take it to one of the local Cadillac dealers and have them do the job - then you have someone to bitch at if there's a glitch. I forget who's over there....was born and raised in Ch Ch right off the circle in MD.