Many exhaust headers are designed specifically for certain vehicle models or engine configurations, there are also universal or custom headers available that can fit a variety of vehicles. For example, it is suitable for exhaust pipes of honda civic si fg2/fa5, scion tc ant10 jdm, acura rsx non type s, etc. At the same time, the spelab store is still selling exhaust manifold , clamps , intake manifold, up-pipe and other products.
Source: https://www.spelabautoparts.com/collections/other-brand-exhaust-header