It will definitely show a change, but from the car moving sooner. When I heard that with the low gear set 904 I would “lose” flash rpm I got nervous. In reality you lose flash rpm, but you actually get to power band quicker during the run and while moving faster. I reach peak torque 1/2 sec quicker. Flash being stomp on the pedal off idle and how high the rpm’s climb BEFORE the car moves. Not really the same as if you actually took some flash rpm out of the converter.