This 36 mm diameter intake manifold is specifically designed for the ST12 and SW20 models. It's a high-quality replacement part that will fit perfectly into your existing system. The intake manifold ensures that air and fuel reach the engine for optimal performance. It's important that the intake manifold functions properly for the engine to run smoothly. This set includes two intake manifolds, as these models require two intake manifolds. This ensures that you have all the necessary parts right at hand. With this intake manifold set, you can ensure your engine stays in top condition and can develop its full power. Trust in the quality and precision fit of this replacement part for your vehicle.