From the parts cost they want them to be disposable. I've been going thru the cost of a simple V4 overhaul; rings, bearings, head gaskets, rod bolts, collets, shims etc. $2K. New rev oil pump $700? So you're closing on $3K if nothings wrong. I'm looking at going thru one of these and I'd say minimum 40 hrs probably more like 60 to blueprint. $6k to 10K labor. Titanium valve collets as used in the R's are $50 per pair. This is the reason I think no one seems to want to build these. The greed is from Audi. Parts cost tripled with their ownership.