My scientific, financial and human behaviorist mind hasn't seen anything that indicates an after market CDI is worth the extra cash. I see claims of seat of the pants experience, but no in-depth review.
No dynomometer? How about at least a quarter mile run? Indicate what type of engine you're running, what mods you've done or stock engine, what brand engine, jet size, carbruretor, the time of day, humidity, temperature, wind speed, elevation, barometric pressure, etc. Most of the weather information is available from Weather Underground. Make several runs and post your results of before and after. It shouldn't take too long to switch from one CDI unit to another. Not that difficult. You don't need a race track.
I am not trying to start an argument or flame this post. Time and money could be spent on other mods that will yield better results. For the majority of users, the stock ignition is just fine. Adjusting your timing with a timing light, degree wheel and an indicator result in better performance than spending money on a CDI?
If you want to spend the money on an after market CDI that's your choice. It's your money. I just want to see the facts. Just as Sgt. Joe Friday use to say on Dragnet - "Just the facts ma'am."
Chris
AKA: BigBlue