2 1/2 months ago mazda ran out of the 12a stock rotor housings, we have been without parts to rebuild engine for 4 1/2 months that I know of, I called 4/23 and mazda said it may be 8 weeks or more, please write the CRB and ask for the 12a turbo housing be listed as an alternate part number (N210-10-100 and N210-10-150) these have bigger exhaust ports and yeild 8-10 hp more than stock. CRB is already considering a adjustment for the rx7 so now would be the time to write in. thanks