How does it seem compared to your ZX14?
Be sure to try riding it with 38/42 psi in the tires. And don't expect much from the stock M3's, if still on there. (2500-3000 miles typically). I love my Pirelli Angel GT's.
Some things that I did to mine that improved it significantly:
- $12 grip puppies. Neoprene slide-ons that reduce vibration and make the skinny grip a little fatter.
- carefully adjusting throttle cable play. There was too much play initially, and the bike was very easy to stall in traffic
- Fiamm horn to replaced the meeper with a beeper.
- Booster Plug. This thing mostly cleared up the delay around 5,000 rpm under acceleration and it really, really improved low-power throttle response. Made it much less likely for me to stall it in traffic. Just eliminated a lot of frustrations with the overly-lean fueling map.
-a pair of switched Powerlet outlets in the front fairing panel (see my pics here: BMW Motorcycle
I added a power distribution fuse box as well there, and my mechanic tied it to the Canbus system at the tail light somehow (to make it switch off after key is off).
-to fix a hot start issue I had the BMW hot start 'kit' done by the dealer. This first involved some 2-hour test to determine it was needed (at BMW's expense, for both test and kit). Installation of the kit took the dealer a couple of hours. Kit had to be ordered after the hot start testing, so this isn't something you just drive to the dealer to have done in a day.
I added Sport Panniers and a luggage grid. Like many many others, the nuts pressed into the grab handles spun in place and the BMW dealer had to warranty-replace some frame members when installing the luggage grid. Look into this closely if you plan on adding a luggage grip.
I added a centerstand, but I've rarely used it. I thought a) it would be easier to fuel on the centerstand, b) the stock sidestand would sink into the hot Phoenix asphault, and c) I'd just use it all the time like I did on my K100RS (to prevent smoking on startup). Turns out I almost never use it, but it did come in handy on a trip once when I punctured the rear tire. (Bike was too low to use the sidestand.)
I didn't like the stock seat and replaced it with a heated Corbin seat. That heat is a godsend in cold weather, but Corbin seats run a little hard. Ask for a bit more padding than stock. I tried sitting on a mouse pad for a bit on my last trip (proof of concept), and it was significantly more comfortable - until the pad blew off at some point.