Have the PM Tuning pipe on my Stella motor, but it's running a PWK34 with VForce4 reeds. I have a Venturi/Bellmouth for it, too, now that you mention it, so I could potentially replicate the experiment on there. I put it on but almost immediately took it off because it made that thing LOUD, even compared to the PMTuning exhaust.
Do you still have a reed valve Stella? How about a pipe such as a PM Tuning? Would be interested to see those results also.
Have the PM Tuning pipe on my Stella motor, but it's running a PWK34 with VForce4 reeds. I have a Venturi/Bellmouth for it, too, now that you mention it, so I could potentially replicate the experiment on there. I put it on but almost immediately took it off because it made that thing LOUD, even compared to the PMTuning exhaust.