I was wondering if anyone has any information on comparing the Stage 1 a/c versus the Heavy Breather a/c? which will perform better and what is the horsepower difference?

 

I've got both, the Stage 1, and the SE Heavy Breather. You're not going to notice much difference between the Heavy Breather and any other high volume intakes out there. I haven't had mine dyno'd, but I seriously doubt you'd notice anymore than possibly 1 HP difference if you're just talking comparisons between the SE Heavy Breather and another highflow intake.