Hello.
I've had a 2006 Vulcan 2000 for a couple of years now and ran across an interesting mod on one of the other sites and thought I'd try it.
The shifter incorporates a switch in it that sends a different value to the ecu depending on what gear it is in. This restricts ignition timing in the first (4) gears and kills performance.
The mod is easy and involves cutting (1) wire, stripping another and putting a 6 cent 432 ohm resistor in the circuit. In other words it routes the signal going to the ecu through the resistor and makes the ecu think the bike is in 5th gear all the time.
The net result is WAY better part-throttle response and overall power.
It is well worth the 20 minutes it takes to do this and makes the bike feel a couple of hundred pounds lighter. It is WAY more responsive.
No check-engine lights, no negative effects whatsoever.
If you would like more information, post up or pm me.
Ron