Total and complete absence of any and all mid range and low rpm vibrations.
I can barely tell if my car is even running anymore. I added 6 ounces of it to a full tank and now it accelerates so smoothly that I can no longer track engine speed with sense of touch, nor sound. It accelerates quicker too. Ever seen an automatic RX-7 drift?
Totally wants to suck up the road on every occasion possible.
I HIGHLY recommend this product, but I guess you guys already knew that.