If you have purchased one of our engine kits and want to achieve the full performance, you will need to have an exhaust manifold and system that matches our recommended design exactly. We have spent a considerable amount of time on the dyno, rolling road and track testing to get the designs we have developed to produce the ultimate performance. Even if you are not running our engine kits, we believe our manifold design will allow you to improve the performance of your engine.
If you can find a manufacturer who has produced an off-the-shelf manifold that exactly matches our design, we recommend that the exhaust manifold is fitted when you initially install the engine to ensure it fits your installation correctly as fitting at a later date may mean that the off-the-shelf one may not fit. Some modifications to the shell, engine mounts, cross members and sump pan (if running wet sump) 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. Please click
here to see modification for the big winged sump.
Even if you are considering a custom made exhaust manifold and system for your car, we would recommend that you ensure you speak to the company that are manufacturing the exhaust for you before completing the installation so that there is sufficient space for the exhaust manifold and system to be made and fitted correctly.