If i install the kuryakyn hypercharger on my 2003 softail standard fxst will i have to rejet the carb to the hypercharger to get max preformance?

 

are you running stock exhaust?? you probably will have to change jets, your MAX horsepower gain probably wont even be noticeable to be honest!
you can get a stage 1 jet kit of e bay, you will have to drill the carb if it is a stock cv carb! not to much of a big deal!

 

I have Vance & Hines long shots on it. i already have a stage one screaming eagle air filter i just want to find another air filter to give me some more hp. i also have a dynajet thunderslide jet kit i havent put in yet.

 

Sorry bro, that Hypercharger is for the birds. It belongs on a Big Block blown Chevy, not a Harley lol.