I didn't say a guaranteed 1/10th, just calculated, because the addition of your 5hp. Theory and calculations don't always work in every situation. A lot has to do with the driver too. You can take the same car and let the owner drive the quarter, then let a more experienced racer drive and beat the owner's time, with all the same mods, weight, etc. But I don't think any of these things apply to the race this guy is talking about.
