[R111S]

It might be a total waste of time/money but if you must make improvements...

My '99 R1100S Modification List - Total Mods: 30

Engine:
1) K&N OEM replacement Air Filter
2) Z-Technik Exhaust System - Stainless Steel w/Titanium Mufflers
3) Air Snorkel restriction widened w/Copper Tube Insert
4) E3.64 Spark Plugs
5) R1200 Left Cam Chain Tensioner Upgrade
6) PCV Hose Guard Strip on ABS Carrier Cage
7) Used YamahaBond #4 to seal new Oil Level Sight Glass
8) BMW Engine Valve Cover Guards
9) O2 Sensor (Bosch P/N: 13474)
10) Charcoal Canister Removed

Chassis:
1) Wilbers Suspension front and rear
2) Rear Suspension Mud Guard - Black Closed Cell Foam
3) ABS Module Reset Switch
4) EBC "Double H" Brake Pads FA407HH front and FA363HH rear
5) Spiegler Braided Steel Brake Lines
6) Panasonic SLA Battery LC-X1220P
7) Brake and Clutch Levers rotated forward
8) Put Foam Block Vibration Dampers inside Relay and Fuse Boxes
9) Added Rubber Inserts to tighten up Fuel Tank Front Mounts
10) Drilled three Vent Holes in Fuel Tank Filler Neck
11) Rear Wheel Center Hole Plug (Wunderlich P/N: 8160270)
12) VW Lug Nut Covers on Rear Wheel Lug Nuts - Painted Silver
13) Front Fender Lower Extension made from R1100RS front fender
14) Corbin Seat w/detachable Backrest
15) Stebel Nautilus Dual Tone Air Horn - 139dB

Lighting:
1) LED Rear Taillight plus 555 Timer Brake Flasher Circuit
2) LED Rear Running Lights (red) inside Blinker Housings
3) LED Front Running Lights (yellow) inside Blinker Housings
4) HID Headlights (H1 and H7 Bulbs) - 5000K 35W
5) Driving Lights (H3 100W Bulbs) mounted on Mirror Stalks