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Exhaust manifold cracks on a 200

Recently I installed a new timing belt/h2o pump on my 90 200.  Unfortunately,
I tweaked the intake valve on #1 cyl when the camgear moved
degrees counter clockwise while I attempted to break loose the bolt.
The result, a bent intake valve on #1 cyl.  Local Audi dealer wants $3k
to repair, including $1100 for a new exhaust manifold, which is almost 
always cracked according to the service mngr.  No prior symptoms suggesting
a problem with a cracked manifold.  Any thoughts on this?  BTW,
Re the prior questions re interference vs non-interence valves, here,s some
expensive evidence.  Mike Posner