I have been running the same plug for years with no problems. However I was just wondering about all of the "hi-performance" plugs out. Is there really any performance improvement to be had. There is Accell U grove, Split Fire & a new one I have seen called E-3. Has anybody switched to one of these plugs with no other changes & saw an improvement on the time slip? Would be very interested to hear what you guys have to report on this.