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"I'd say K&B has the worst track record according to this thread. Not user friendly at all and yes I do know how to tune an engine "

Try another thread. There are many K&B fans. The only problems I am aware of are with the very early Sportsters without the crankshaft bushing. (I think a new bushing is still available at moderate cost to correct this if you have one of the old ones.)

jess