So far,,, powdercoating costs, ATI damper, and that is about it for the bottom end. I bought a salvage 06'TSX engine/trans for 1600 and sold it for 3800, then bought a K24A1 short block and the pistons and rods and then coating. The top end is a Z3 head that I bought 3 of when Honda had first released the RBC/Z3 head for sale in the USDM(they listed complete Z3 heads for 350) Then when they realized the mistake they went back to the original price, so I sold 2 of mine for a decent profit and the buyer got a price well below on-line prices.