DRIVER SKILL!!!!! has a big part in it Vtec!!, i went out in GTijames's ed30 with all his mods, and yes its faster, sounds the bussines, but figure of 315-320 are way way out imo. We saw 4-5 std GTi 5's today producing stock readings.
You have a talent being able to launch an ed30 from a standing start Vtec, im sure you in the hands of any of the modded ed30's would produce simular results, but i really cant see Revo giving nearly 40bhp then other mapping companys. They even said, that 315+ is "Very Poptimistic" with the mods that have been done to your Vehical.
You must either come south, with blue_182 aswell, or try DD rollers.