i noticed a bit of difference when i used vpower racing in my ep3. When vtec kicked in it just had a bit more of a kick. But i only use bp ultimate now. Car runs good on it. Reason why im not going to b using much of vpower racing is because i heard the ethanol can eat at ur fuel lines. Wish it didnt do that because that fuel makes my car roar ! ! Might use it on a track day mayb