theres plenty difference between 19t and 23t 19t has plenty power closer to a mild mod and the 27t is nothing more than a fast 27t if you've run as much 19t as we have been doing here in fla we are almost as fast as mods we even run 4cell 19t in 12 scales and we are fast! faster then six cell mod sedans. now that roar is making it a class you going to see a lot of guys stop running stock.