I had IC 2 & 4 burn out on me after a year of running BCB stage 2/stage 2 eco tunes down here in South Florida. 93 octane pump gas. Denso iridium hot plugs. I swapped IC's 2 & 4 out with backups from same manufacturer, switched to colder set of NGK pulgs suggested by Casey @ BCB, and started using 12 gallons 93 octane/4 gallons e85. Car idles smoother, seems to have much more torque on demand, and no more spider webbing on coil boots