OK then so what has happened the exhaust has happened in the last 2 months as it would/should fail an MOT if it was blowing out at the time. An exhaust is something we all have to deal with at some time and the manifold is a common problem mostly caused by engine mounts allowing more than normal movement or someone being rough working with the rest of the exhaust system and not thinking what's happening at the other end so at this stage you need to consider is this the only problem or signs of more ( timing belts due, gearbox etc.) and if you can afford to run the car maintenance wise and what the car is 2006, 2007, 2008 etc.and what's been paid for it. To continue you have choices fix what ever manifold you choose, or sell both as spares or trade in and buy another repaired one, or buy a new aftermarket one with possibility of adjustments needed when fitting and possible remap all options will require engine mount work in order to maximise the life of the manifold replacement to be honest the new genuine lower mount is much stronger the gearbox one is cheap just longer to fit and the upper genuine one is fine and if it starts to go you can put a powerflex bush in it now or until that time it's needed. I cant speak of the vibrations of upgraded mounts I prefer comfort and originality myself and it's something you can talk about for weeks but two seconds experiencing it will make your mind up.
