A point that should be considered is not only money but heat. The stock harley pipes that converge on your right side and blow off all that heat into your crotch. Isn't so bad in a mid temperature climate, but when you live in a hot climate the heat can be quite something to deal with.
To really get a feel for this rent a harley in las vegas during the summer and ride around town for an hour. (if you can take it) You will be convinced quickly.
By storing away your stock pipes and putting on something like the BUB Pipes (Rineharts) or the WhiteBrothers E-Series you can pick up some horsepower and relieve that heat problem. There are other pipes that do the same, but I have chosen these as my poison of choice.
A side note: depending on where and when you bought your Rhineharts they can come with either a 2 1/4 or a 2 1/2 inch baffle inside the pipe. To tell which you have you have to pull off the black cones on the end of the pipe to be able to tell which you have. If you have a 103 or under you most definately want to be sure you have the 2 1/4 cores it will hurt your horsepower. My understanding is BUB is now only shipping the 2 1/4 to dealers and the 2 1/2 are an upgrade or special order.
For the horsepower nuts you might find this interesting some racers i know have a 124 Road King that they use for drag racing on the circuit they have chosen to go back to the 2 1/4 baffles for the track as the 2 1/2 hurt their numbers and eta's. In my case the 2 1/2 seem to help my numbers a bit. Only reasons I didnt want to go to the Mountain Baffle on the E Pipe was because I wanted the sleeper look back for my ultra and the fact that the Rhineharts were much quieter for talking on the bike / stereo until you got on them, was definately an appealing fact.
Ride Safe,
-Unbalanced