There has been a long going debate on them. I thought about running them on my turboed motr some M22 Wild Fi cams, the specs on them are awesome, nice lift and duration but that's not everything, there is opening and closing at what degree etc etc. The specs are nice and Robert akak Robert seems tobe knowledgeable and believes in them but as the others have posted there have been no REAL DYNO #s or times from them yet. They have posted dynos with no #s to protect the owners without giving out their info but still, it woudl be nice to see some #s. I am not hating at all I would try them out if I was all motor probably. Also we need to see the longevity for them, Crowers look great on papaer but the #s I have seen aren't the most impressive like soem Skunk2 Stage 2 cams or JUN or Toda really except for 0psi but he has more in it with much better cams too!