I've been looking at a new centre section and backbox, but the all seem to be the flange fitting and mines a sleeve ATM.

It guessing that it doesn't matter as I'll be replacing the centre section and backbox so that connection will fit fine.

What worries me is the CAT in my old T reg MK4 was after the flexible pipe and on my 53 MK4 Twinport is built in to the manifold so there's a bit of a difference in the system where they centre section is gonna connect too.

Just wondered how simaler these 2 systems were? And if a standard after market centre section and backbox(back box doesn't worry me) would all fit?

Is what I've been looking at.