As used on our turbo systems. A custom-formed silicone hose to mate up to the throttle body. It includes a 1.375" outlet for a bypass or blowoff valve and a 3/8 NPT threaded port for a temp sensor. The stainless steel pipe allows you to connect it to your intercooler outlet pipe and will not rust internally like mild steel pipes can. 2.5" inlet.
It will work on a MSM if you have an FM intercooler and you also install our intercooler outlet pipe. The stock MSM intake air temp sensor is an M10 thread, so it will need to be relocated if you're using it - standalone ECUs will typically use an aftermarket 3/8 NPT sensor, so this is typically only an issue on cars with stock ECUs.
For the 1999-05 throttle body. If you have done a 1.8 swap on your early car, you'll need to match this pipe to the throttle body you used.