"J" Electrics Difference???

[Kart 15]

Could someone tell me what the difference is between the electrics of an old J and a newer J?

What has actually changed and does one work out to perform better than another?

Someone told me that Tci has been known to have a slightly weaker spark output at lower revs than the old cdi system is this true?

[Kart 66]

Someone from the bitchemen said that the new j electrics tend to foul up plugs more often but I have never seen this for myself so I don't know if it is true was just putting it out there.

[Kart 17]

Both are the same according to dyno. New ones would be better as they would have less problems ;D

Some people say all the quick guys run old electrics. This is probably because their motor is old not that they are better.