The intake manifold needed velocity stacks so I had to whip out some brain power to make them myself. Started with a piece of 1.5" thick, 4" diameter carbon steel round bar and rough turned half of it in to chips and shavings. Then using matlab and excel I generated and printed a list of X,Y coordinates that described an exponential curve 15mm deep and 10mm wide. Hitting an X coordinate every .25mm is a pretty good middle ground but is still incredibly time consuming even with a good digital readout. In the pic you can see the curve is about half done. The finished press tool with 40mm long pieces of tubing. Also visible is the gratuitous amounts of bearing grease I used on the tool to facilitate pressing and to keep galling to a minimum. I'll get some better close up pics when I have the intake manifold welded up complete with runners.