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Spark Plug wire size

Like was said before unless you are running high output ignition coils you don't need the thick wires. The thickness is insulation to keep the spark inside the wire.
 
I agree with all of the above regarding wire size. There is, however, a set up with dyno proven results to increase spark and power. After reading the article in the last month's edition of American Bagger magazine I installed a set of Nology Hotwires on my 03 FLHTPI and there is a very definite improvement in power. If you look for them online be sure to search nology.com which is the manufacturer and nologyhotwire.com which is a retail distributor.
 
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