i have a dynatek cdi on my raptor. it gives it waaaay better throttle response.. better spark.. easier starting.. better everything really. i highly recommend dynatek
If you want to rev activate nos, run a tach, set rev limits, it'll do it all. You can plug it right in and use the preset four curves though, and they are already damn good.
mine is a prototype from dynatek. you can't actually buy them yet for the raptors. although i may sell mine for the right price because money is getting tight