300 WHP on what dyno? every dyno reads differently.
a local here had the same mods that you listed and on his 06 and made 300WHP/330WTQ on a dynojet (they tend to read higher than any other dyno). your location/elevation/etc will all play factors as well.
do you plan on using the OTS vf39 map or will you be getting a custom tune using the accessport?