The dyno is 2.5% off and has been proved to be with subsequent tests on that dyno and then a Superflo with the same engine. The engine is nothing like you think it is......a total mess to be honest.......it was a mistake to spend that much money on it but that was then and this is now. I 100% believe that this engines intake and heads are the best in the country, period, but with that said for what it took to get there may not be something i'm proud to say either.