So I have finally had to do what I was trying to avoid.  Odo has nearly clicked 69k miles. Mixed urban and longer runs.  I've had car last 35k miles so highly unlikely it has been done, and no signs of inlet manifold or charge pipes having every been removed before.   Waiting for the injectors to come back after cleaning and testing.   Hopefully put it back together on Friday. Fingers crossed.   It wasn't as bad as I thought it might be. I went very slow and watched