We just started the mold on our new 13B baffled oil filler necks. These were originally designed for the 13BREW found in the FD, but with a new base these will clear the 13BT engines found in the FC, or any other older 13B. Some applications won't need a base, but will look kinda silly sitting WAY up high. This will be a seperate product, that will be releasing very soon. Our filler neck is designed for a closed loop system, with a catch can mounted higher than the return port on the 1st bend( the smaller 6an unit). With a one way check valve, if your catch can does start to fill up, the excess can bleed back down into the oil pan so you don't have to pull over inbetween sessions at the track. This is a common problem under high lateral acceleration, especially on engines that are more worn out. The filler neck is also very well baffled to help prevent as little amount of oil as possible getting to the catch can, if you cannot do a closed loop system. One can simply plug this bypass port with a 6AN ORB plug( not included).

https://turbosource.com/products/tur...il-filler-neck

 

We have confirmed fitment on the FC3S 13BT engines using the OEM press in base. The only fitment issue is if you are using a greddy elbow you won't be able to use our return port with the OEM base, our new unit will fix this, as it drops the filler neck down and allows you to change the alignment of the bolt holes.