I'm glad i was of some help GTV68. The exhaust manifold in the pic was part of the kit sold by Alfa for the Trofeo race series. It pairs the cylinders from the opposite sides. If you can't find one it is fairly easy to modify the one on your car. From the pic you can estimate the length of the primary tubes and where they should be joined. Bring your car to an exhaust workshop and have your manifold cut to the appropriate lengths and then bended like in the pic. The tubes can afterwards be joined and welded using the existing y sections. Et voila you have a race manifold! I'm having one done for my car too.