http://www.flowperformance.com/system.html
It works great but I last used it 4 months ago. It sits in my garage shiney and newlike. They go for $997 new. You'd be hard pressed to tell this one isn't new. $600 Comes with all software, charts and excel spreadsheets I have. Really makes headflowing easy and quick instead of the painfull process it is. Requires a 5hp shop vac minimum to run. Sometimes people will put two in chain depending on how big the port is. I never had to but I was also flowing small 4 cylinder heads. The diesel tractor guys have a whole series of pitot tubes for these benches for velocity measurements. I can take Visa/MC through the shop but if I do that and your instate I've got to charge you sales tax. Will box and ship to anywhere in the US for $20. I've got various pieces of lexan for different "bores" and for visualizing things. I'll throw it all in there.