I have a Turbo III legal and my cousin has a RDLogics one piece legal. The only pipe I can compare mine to is the THS outlaw pipe I was running before. I have slightly more power all around the powerband with the turbo III, even though it has the legal stinger.
The 'reinforced' stinger on the turbo III looks good on paper but in reality it gets damaged just as easily if not easier than a traditional stinger. My THS pipe withstood a good deal of punishment at the stinger portion and it still looks fine. On the other hand, yesterday was the second race I had with the turbo III and also the second time I had to pull a dent around the stinger area. The whole area, including the reinforced portion, were simply pushed in together as a unit.