As stated before, the cylinder head cover used on all of the new NG6 engines
is made from plastic. However, the design differs between the engines due to
engine equipment.
For example, the N54 engine does not use Valvetronic and therefore does not need
the accommodation for the
VVT motor. Also,
The gas generator is a pyrotechnic component of:
Airbag module
Driver's/passenger airbag
Side airbags
Head airbag
Knee airbag
Belt pretensioner
Belt buckle tensioner
Safety battery terminal
1 Series: E81, E87
3 Series: E46, E90, E91, E92, E93
5 Series: E60, E61 from build date 09/2