Imola 186 inlet manifold split

Lads
A mate has an imola 186 kit that’s done approx
350 Miles since built & the rubber has split!!
Which is fine?
But on stripping it off for him, the rubber/manifold
Is all one piece?? Has anyone had this issue ?
& has a way of fixing this ?

Cheers
A mate has an imola 186 kit that’s done approx
350 Miles since built & the rubber has split!!
Which is fine?
But on stripping it off for him, the rubber/manifold
Is all one piece?? Has anyone had this issue ?
& has a way of fixing this ?

Cheers