I have a japan spec 12aT now I wanted to do an agressive street port and I wanted to know if normal 12a housing will work for this engine? I Just read in an other post that new housings should be used when doing a full porting job. and I dont want to lose power, cuz I only did the intake and not exhuast. any one able to toss me a bone.

 

You can use it as long as there are no flaking/deep scratches on the rotor housings. Now, for the side plates, Im not sure if you have a 6port or 4port 12-A. Im not a fan of 6port so I would do an a big streetport on 4port plates plus the usual e-shaft mod and pinning the rotors.

Now for the exhaust part, there are many opinions on how large it should be. I prefer big exhaust ports.

 

i would think that the jap spec 12at would have a different port configuration than the us non turbo 12a, so since ur going to port them anyway, i'd say yes u can use them.

 

turbo 12A has four side intake ports.
Each bank has one injector, located in the intake port near the port opening in the trochoid chamber.
its a cross between manifold and direct-injection , Mazda calls it "semi-direct injection".
I know the engine is pretty basic but its my first turbo experiment if it goes good I'll surely move on to bigger turbo projects.

 

Ok just got the wiring harness for the mega squirt 2 came out to $72 with plus $2 for shipping.