You must fit the exhaust manifold before the shell is finished, as with some rear wheel drive cars using wet sump; sometimes the sump has to be modified.
Some modifications to the shell, engine mounts of cross member may be needed, as everyone fits engines in different positions (especially rear wheel drive) and we cannot guarantee that it will just bolt straight on. It would be impossible to us to have produced a manifold that suited every car & installation. We have made all our manifolds using a donor car that we hope is characteristic of the majority of installations.

If your car is unsuitable for the style of exhaust manifolds shown below, you can purchase our exhaust system designs, which you can then have made up by an exhaust manufacturer. Please contact us for details.