The original Dart Pro 1 exhaust flange sported a bolt pattern that only accommodated stock-style header flanges.
The Platinum Pro 1 below has the capability of accepting big tube headers without an adaptor plate.
Where the wet flow is going is shown to great effect when the dyed fluid is irradiated with ultra violet light. The brighter the blue, the more fuel the air locally contains. The trick is to even out the coloration as much as possible.
The new Dart heads benefited greatly from the extensive wet flow development program they were subjected to. Peak torque was up by 14 lb-ft and peak power was up by 22 hp. The biggest gain was at 5800 rpm, where over 26 extra horses were produced.
Conventional flow testing (such as seen here) reveals little difference between the original Pro 1 (dark blue curves) and the new Platinum Pro 1 (red curves).
Dart's Tony McAfee studies the results from a test. A key factor toward getting meaningful results is keeping a close eye on the air/fluid ratio so that it closely mimics what happens in a running engine.