Seems like the pipes of choice for 'fast' banshees in now the cpi system. Never really seen to many in the past. But this year they were all over at the sand drags. The big motor guys seem to all run them. Both in and out of frame!! Had a buddy that had a banshee with 2 into 1 back in the day and it sounded like a indy car. One of the sweetest sounds iv'e ever heard. His was basically a stocker, but it did run good. It was also pretty quiet, like the noise was cancelled out. But i guess with the "big" stuff they don't work.