OMG!
Barraka,
As you can see in the pictures above there are 2 parts to the exhaust manifold.
What isnt in the picture is another peice of flanged stainless pipe. About 6" long
The over all lenght of the 4 branch as stated above is longer than the original but there is still a gap of 6" once the decat is taken off. This gap is filled by the 6" pipe. (the decat is longer than 6" BTW)
At a squeeze my decat will go back on.
You have a different engine to me, so I can't say if it will be the same case for you or not.
Hope that has helped you!