Does anyone have any experiences with these? (TPO Dragon spark plug wire)
What other magnufacturers are out good?
Yes, my Duc manual recommends resistor plugs, which is what I use.For a lot less money I simply rebuilt my wires using new silicon ignition wire from the auto supply and reused the old metal connectors, rubber boots and plug caps. Just rip out the old wires, open up the connetors, lube the boots with some silicone grease [not petrol or synthetic] slide them on, strip, land the wires and recrimp the conectors. You'll need some type of connector crimping tool to recrimp them.
Re:EMI, Sahzaam is right, resistor wires or plugs will reduce EMI. Its created due to high frequency current spikes caused by arcing across the spark plug gap. Resistors help limit the arc current and actually help maintain the spark longer. This high frequency, vey high high voltage "noise" is really like a RF transmitter and can easily be picked up by the wiring coming from sensors and going to the ECU. Most sensor wires on Ducati's are not electrically shielded. Thing is, spark plugs specified by Ducati are all resistor type - thats the R in the part number. Using resistor wire will help reduce EMI even with resistor plugs but not all that much. I'll bet those who reported "no problems" were likely using resistor plugs too.