No idea, as yet. It was part of a whole bunch of modifications (2.4 inlet, 68mm SC throttle body, ported head, cams, SC injectors, removing balancer shafts and lightened flywheel). The manifold was obviously required to help sort the exhaust and was a decent excuse to upgrade the cracked OEM manifold.
Unfortunately the car isn't overly happy with the mods and throws a random P1514 error and drops into limp mode with no pattern to it (though it might not like my existing StageII map). I'm booked in for a day of remapping, next Wednesday, which will hopefully dampen out the spikes in the MAP sensor readings and make the most of all of the changes.
It does make a nice sound on start up though and the general sound of the exhaust seems a little deeper now. 🙂