I really want to ad a muzzy, but if i do, do i also have to mod the air intake and carb, and if so how hard is it to do. I'm not a mechanic, but can follow instructions prety well. Also how much do the other mods cost? Thanks for any help on the subject

 

whenever you adjust the airflow in or out of the engine you will need to re-jet the carb.
intake mods are best done with an exaust or vise versa.
intake mods and jets are much cheaper than the exaust.
re-jetting is prob the "hardest" part but with directions from this forum and others you should have no problem.
and after you do it once it will only take you 1/4 of the time to do it the next time.kinda like checking and adjusting your valves.