Now, there is a bit of a trade off in torque down low. From 3000 to roughly 5252 rpm where torque and horsepower intersect on the graph the stock head has an advantage. Past 5000 rpm though the ported cylinder head shows torque gains and a flatter curve not dropping off nearly as hard as the OEM design. It breathes much better up to and past the stock redline showing over 600 horsepower on the dyno.
This is definitely a modification for top end horsepower but that is generally an area of weakness on the N54. Plus, if going for all out performance the RPM drop after each shift at redline is not going to have one sitting at low RPM anyway. This cylinder head will shine with a single turbo in a roll on race.
No word on pricing but it is nice to finally see some data from VAC on their N54 cylinder head work.