Motorcycle Repair: rejet carb. and dynojet kit, jet kits, screaming eagle

Question
First of all I replace the oem air filter to a K&N filter, do I need to rejet the carb.? second I been wanted to install a dynojet kit to my  05 sportster883L and ask the dearler for advise and they told me to leave it alone cause I would not notice the different and it s a waste of money, I read all this article regarding the kit will make my bike runs smoother and response quicker, the bike also have a screaming eagle pipe installed, what do you think ?

Answer
I have used Dyna-jet kits for years and found that they give more throttle responce, richen the bike where it suppose to be, and easier starts.
When you changed the air filter and the pipes you leaned ouot the bike so the Dyna-jet kit would be great for it
Good luck and happy riding
Mike