building a flow bench?

Use the manometer as described by DDodger. You don't give two damns about comparable numbers to every other system out there and you don't need computer anything.

All you care about is raw flow improvement and uniformity. If you're not doing this for a living, you can buy way more head than you can make for $1000. How many hot rod motors do you plan on building?

In all reality, you can download a bootleg copy of Labview and rob a bunch of MAP sensors from the salvage yards if you want to get high tech. If you want functional:




Buying a kit is doing little more than making someone else money on the above. Buying a flowbench is cost prohibitive unless you're starting a business, and an inclined tube manometer is all you need to get started on learning the ropes if you did want to start a business.