Mine came out easy peasy, that might be because they were fitted wrong and were loose

As above, really no need to remove the inlet, just undo the injector pipes, undo the 8mm bolts and Bob's your mothers brother, they just pull out.

The collets must be absoultely round and in good condition when put back otherwise they wont seal well. And make sure they're pushed all the way in and flush with the manifold. One of mine werent and a bracket was subsequently bent and I'm convinced that's why it ran like a bag of shite.

Dragsteer did you do the wd-40 test like I said?

Lee