here is my BEST advise.
DO NOT>>>DO NOT>>> do a full system on a r-1...lacking that Xup vaulve will make such a low dip in the mid range it isnt funny....i have seen 4 dyno charts from r-1s with and without the exup...WITH IT still on and just a slip on..i see the best power curves.
my suggestion is...talk to jim at 4&6 and make sure..you get everything explained....WHAT will be and WHat will be done for your best bang for buck.
the slip on you CAN do, installing the air filter...a monkey can do.
installing a jet kit...not bad to do.
CORRECTLY dialing it in....PRICELESS!!
IF you still want to go with your guy...make sure he has a EDDY dyno, dyno to run it on...if not get ready to have a few extra ponies that isnt there. DYNO running and TUNING is the ONLY WAY to correctly PERFECT the jetting...if not...your wasting your time and money