Anybody using Brisk sparkplugs? I wouldn't expect a noticeable gain in hp, even though they claim 5 for 1000cc or bigger engines. But seeing how there is nothing for the spark to arc off of, you would think they would have to produce a more powerful spark. Maybe the bike will idle even smoother, throttle response is improved, or you just get to pay as much for one plug as you would for four. anybody using them?