ROTOR HOUSING, 13B 86-88 TURBO REAR
Rear Rotor Housing, 13B 86-88 Turbo
This is a new Mazda OEM rear Rotor Housing for 86-88 Turbo engines. The pictures show the difference in the EGR passages between the front and rear housings. The one picture with the front AND rear housings shows which passaage for which housing – green/left/front, red/right/rear.
These also work fine in the 86-91 NON-Turbo engines, especially if you plug the water passage from the housing into the intake manifold. The turbos use this, the non-turbos do not. You can also use the “O” rings from the non-turbo with silicone.
These are the housings we always use for 86-92 non-turbo PORTED engines as those exhaust sleeves in the non-turbos are about impossible to port with that diffuser in them.
As of May 2018 these rear S4 housings are still the least expensive of any of the 86-95 and 20B rotor housings.