NGK TR7IX's here. The irdium plugs can and will withstand alot more punishment than regular copper plugs, (pinging and detonation etc.). Every truck, build, and tune mostly differ, so they may work well for you, and they may not. For anyone on here to say that that plug or this plug or any plug is the best just does not make sense, again every setup is different. So you may notice a difference or you may not. We try to only use the TR6 or 7IX's at our shop, we have seen them work well compared to other plugs in most applications... Stan
