Hi and welcome to our lill forum..
Exhaust manifold....'log' type that is similar in style to the
no longer available FiNe one is by a company called GizFab.
Not cheap but top grade item...no remap required...but
worth having it done anyway to get THE best from it and the
engine.
NOTE...when you do the brakes and bleed them, be aware
that the same fluid reservoir supplies the hydraulic clutch...
so you must bleed that as well.
Re passenger side window...could well be a relay..
check out this for lots of info, including relays:-
https://www.forfour.co.uk/forum/index.php?topic=1716.0