The duct is very similar to the one on the Red Bull and the Force India (the other two teams using such a device this season). The only major difference is in the use of two (rather than one) separate channels to divert the airflow from the bottom to the top of the chassis. Also on the MP4-30 in Malaysia were a new front wing and new sidepods fins (with three fins instead of two).
Latest / Technical
McLaren MP4-30 - updated aero package
30 Mar 2015