Graeme raises a good point, dyno readings vary between shops. If you take it to a Dyno Dynamics dyno, get them to use shootout mode as that is what most people use when reading hp figures.
The only way you can tell is to put another VR-4 on their dyno and see how it compares.
The only way you can tell is to put another VR-4 on their dyno and see how it compares.