Welcome Mr. bdpakaknox to the best forum for Concours (KonKoor- silent "s") aficionados. For me the 4 things I changed immediately were:
1). Threw out the Crapstone 021 tires and got Michelin PR's with 55 rear aspect ratio- the best and safest tires I've ever ridden on in 45 years.
2). Got the 2" risers and shark skin bar grips.
3). Got Seth Laam to build an awesome "all week" seat.
4). Dumpsterized the black bazooka and got a Vance & Hines CS-1 slip-on. Now it looks, performs and sounds like a proper sport-tourer.
I did these same mods, but have a Delkovic slip on, same same. I'd wear out the stock tires, no sense throwing them away. Lots of good replacements, I'll name names (Pirelli Angel GT, Michelin PR2/3/4, whichever, those are all the tires I have experience with on this bike).
I also put HID and a LOUD horn on it, wonderful mods!
And the flash, oh yes, get the flash from SISF. SISF means the guy whose username is Steve in Sunny Florida. I go the gas gauge mod from Brian, aka BDF.
Radar detector, GPS and I unlinked the brakes, which I like but some consider heresy. Take your time, this bike lasts a long time.
EDIT: The
FIRST mod you should make it to protect the top of the bags from the hideous scratches you'll cause when you swing your leg over. Various solutions, from various sticky stuff to custom made stuff. If you don't like the first fix, do something else. Some people put various forms of shelf paper adhesive, very inexpensive. See through is most popular.
Also a good tank protector and something along the sides of the tank where your legs rub. My brother bought some really cool bumpy stuff, like 'ribbed for his pleasure' almost. I have an OEM solution but I wish I would have gotten what he got. I have no idea what the product is or where he got it, but it's very cool, protects the sides of the tank and also makes it easier to grab on with your legs.
I forgot, I also put reflective stickers on the back of the bags, they cover the whole back end and are very obvious when headlights hit them, makes you much more visible from the rear at night.