I guess the number misalignment can be attributed to the Engine dyno guy is different to the chassis dyno guy and different machines obviously. I put more value in the chassis dyno results. The chassis dyno operator is well known in the circuit and drag racing circles and typically the power readings are conservative. e.g on numerous occasions his conservative power rated tuned racecars have driven the doors off other machines with pronounced higher outputs. I see it as nothing more than a tuning aide.