Tbg, I have tried the IC and it rarely makes a difference. Sometimes I think it does, then I say no it doesn't. The Nespa ALWAYS makes a BIG differnce, nothing you have to even think about, you just know! The wife hears a differnce, even my kids can hear the differnce (though they don't care). No one else has ever heard an improvement from the IC when I have tried it with friends, they think I've gone off the deep end ...... just my experices.