The resistence acts as a supressor to the "spark" noise in the RF band that you would hear if the resistence were not there. As the voltage jumps the gap a spike across all rf bands is heard during the instant of the spark (This is how early radio was achieved). Multiply this by 3000 at idle for instance, if your sled has a 1500rpm idle, and you can see where this could be an issue.
While there are non-resistor plugs out there why risk it. The performance increase if there is any is not worth the risk to your equipment. I'd hate to smoke a coil out in the woods and need a tow or worse have to hoof it out. Stick with the stock plugs and wires. BR9ES's are cheap and easy to find. The boots do seem to have a limited life span on some sleds but I have yet to replace a boot on a Yamaha. On a Polaris is another matter.