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Just ordered a new S4 13BT rear iron from Mazdatrix.
Mazdatrix confirmed that Mazda does send a new unit with the beefier casting, so I will only have to port the new iron as opposed to having to deal with buying a S5 rear iron and enlarging the rest of my S4 ports to comply with the 1/8 '' S5 larger port.
Mazdatrix recommended that I buy a new rear rotor housing since they state all cracked rear iron motors "oval" the dowel hole area on the rear rotor housing.
I am skeptical since I do not push high boost and the rear iron did not explode on me.
I requested some measurements from them regarding limits on the rear housing since the FSM does not specify in the ENGINE secition and the TECHNICAL INFO section as well.
I am awaiting a response.
Stay tuned
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Same pig, new soul 
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