Ive been told as of late that jammers (most of the time) are very inaccurate. They say most of the sets dont exactly match up and their power #s are overrated. I have jammer 4s and have been taold I'd only see maybe 100hp out of them on a dyno. This true?

 

Id go with f1's or haisley. Ive got a friend with a twin setup (pretty small)
He started with 120 jammers and saw high temps right before spool up bad idle and hard start. We thought IP was going but he changed to the f1 120 before the pump change, No hard start, No Bad Idle, LOTS More power and alot lower temps. Im not sure on the exact numbers but i do know i would run jammers