Its fairly straight fwd, What engine is it, Mine is the G13BB, not the M13A, But it took less than 15mins to get at it. Whilst i was removing the head for a head Gasket problem.
there are 9 bolts actually holding it to the head, but There's a heat shield on top of that with 4 i think.
I snapped a few of the heat shield bolts-or studs, but not replaced them yet.
Mine are all 8mm studs but with the jap style 12mm socket/spanner nuts as opposed to 13mm on british 8mm or m8 nuts.
They are probably going to be rusted or corroded but give them a squirt of a release agent like wd40 or i use something called plusgas you may be lucky and not have any hassle.
The manifold will come away easily once undone from head- but be carefull of the lambda sensor its a few inches down, and the lead prevents it from going to far away, But you should have enough room to move of the head and get at the old gasket- , remove it, clean both surfaces and replace for a new one.
i've got a pic of the manifold on the side as i was taking the head off.
the heat shield has already been taken off,
gasket is only a few quid mine is the all metal type and is multi layered here is one
g13bb exhaust gasket
Hope this helps !!, i should imagine the M13a engine will be similar if yours is one !!
